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Random assignment

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method because it provides control for all attributes of the members of the samples—in contrast to matching on only one or more variables—and provides the mathematical basis for estimating the likelihood of group equivalence for characteristics one is interested in, both for pretreatment checks on equivalence and the evaluation of post treatment results using inferential statistics. More advanced statistical modeling can be used to adapt the inference to the sampling method.
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statistically that they did not come from the same population, even though, procedurally, they were assigned from the same total group. For example, using random assignment may create an assignment to groups that has 20 blue-eyed people and 5 brown-eyed people in one group. This is a rare event under random assignment, but it could happen, and when it does it might add some doubt to the causal agent in the experimental hypothesis.
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Imagine an experiment in which the participants are not randomly assigned; perhaps the first 10 people to arrive are assigned to the Experimental group, and the last 10 people to arrive are assigned to the Control group. At the end of the experiment, the experimenter finds differences between the
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Random sampling is a related, but distinct, process. Random sampling is recruiting participants in a way that they represent a larger population. Because most basic statistical tests require the hypothesis of an independent randomly sampled population, random assignment is the desired assignment
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Imagine the experimenter instead uses a coin flip to randomly assign participants. If the coin lands heads-up, the participant is assigned to the Experimental group. If the coin lands tails-up, the participant is assigned to the Control group. At the end of the experiment, the experimenter finds
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that they are equal to the same population mean (i.e., population mean of differences = 0), given the probability distribution, the null hypothesis will sometimes be "rejected," that is, deemed not plausible. That is, the groups will be sufficiently different on the variable tested to conclude
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differences between the Experimental group and the Control group. Because each participant had an equal chance of being placed in any group, it is unlikely the differences could be attributable to some other preexisting attribute of the participant, e.g. those who arrived on time versus late.
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Experimental group and the Control group, and claims these differences are a result of the experimental procedure. However, they also may be due to some other preexisting attribute of the participants, e.g. people who arrive early versus people who arrive late.
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Random assignment does not guarantee that the groups are matched or equivalent. The groups may still differ on some preexisting attribute due to chance. The use of random assignment cannot eliminate this possibility, but it greatly reduces it.
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at the outset of the experiment. Thus, any differences between groups recorded at the end of the experiment can be more confidently attributed to the experimental procedures or treatment.
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to evaluate their ability to discriminate weights. Peirce's experiment inspired other researchers in psychology and education, which developed a research tradition of
351:. Studies done with pseudo- or quasirandomization are usually given nearly the same weight as those with true randomization but are viewed with a bit more caution. 931: 874: 837: 2548: 533: 3489: 3053: 3203: 2827: 1468: 3814: 2601: 3040: 192: 944: 415: 164: 954: 899: 858: 821: 509: 419: 1463: 1163: 3838: 2067: 1215: 171: 145: 38: 3889: 3727: 3636: 3482: 2850: 2742: 798: 229: 211: 109: 87: 52: 80: 3455: 3028: 2902: 178: 3902: 3610: 3596: 3086: 2747: 2492: 1863: 1453: 747:(eds.), "On the application of probability theory to agricultural experiments: Essay on principles (Section 9)", 3955: 3907: 3137: 2349: 2156: 2045: 2003: 472: 149: 2077: 160: 3380: 2339: 1242: 1072:"Deception, Efficiency, and Random Groups: Psychology and the Gradual Origination of the Random Group Design" 686:"Deception, Efficiency, and Random Groups: Psychology and the Gradual Origination of the Random Group Design" 332: 3808: 3773: 3705: 3561: 3475: 2931: 2880: 2865: 2855: 2724: 2596: 2563: 2389: 2344: 2174: 262: 3929: 3878: 3790: 3443: 3275: 3076: 3000: 2301: 2055: 1724: 1188: 301: 380:
it may be discovered that they differ, even though they were assigned from the same group. If a test of
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To express this same idea statistically - If a randomly assigned group is compared to the
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Process involving chance used in research for allocating experimental subjects to groups
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Design and Analysis of Experiments, Volume I: Introduction to Experimental Design
766: 389: 2769: 991:(September 1988). "Telepathy: Origins of Randomization in Experimental Design". 603:(September 1988). "Telepathy: Origins of Randomization in Experimental Design". 3556: 3228: 3223: 1686: 1616: 1262: 1079: 993: 965: 693: 605: 571: 423: 336: 309: 258: 551:"Social Research Methods - Knowledge Base - Random Selection & Assignment" 3944: 3694: 3571: 3385: 3352: 3215: 3176: 2987: 2956: 2420: 2374: 1979: 1681: 1508: 1272: 1267: 744: 519: 447:
advocated randomization in survey sampling (1934) and in experiments (1923).
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is applied to randomly assigned groups to test the difference between sample
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because they help ensure that the results are not spurious or deceptive via
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Randomization was emphasized in the theory of statistical inference of
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in laboratories and specialized textbooks in the eighteen-hundreds.
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Mathematically, there are distinctions between randomization,
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Design and Analysis of Experiments, Volume 2: Advanced
755:(4) (Translated from (1923) Polish ed.): 465–472, 422:" (1883). Peirce applied randomization in the Peirce- 3054:
Autoregressive conditional heteroskedasticity (ARCH)
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http://psychclassics.yorku.ca/Peirce/small-diffs.htm
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Charles S. Peirce randomly assigned volunteers to a
1121:"What statistical testing is, and what it is not," 152:. Unsourced material may be challenged and removed. 2516: 1037: 782: 642: 781:CaliƄski, Tadeusz & Kageyama, Sanpei (2000). 3942: 785:Block designs: A Randomization approach, Volume 497: 354: 2602:Multivariate adaptive regression splines (MARS) 816:. Vol. I and II (Second ed.). Wiley. 3483: 1157: 873:: CS1 maint: multiple names: authors list ( 836:: CS1 maint: multiple names: authors list ( 261:to different groups in an experiment (e.g., 1125:, 1993, vol 61, pp. 293–316 by Shaver. 1069: 974:Memoirs of the National Academy of Sciences 683: 599: 595: 593: 580:Memoirs of the National Academy of Sciences 562: 560: 53:Learn how and when to remove these messages 3490: 3476: 1202: 1164: 1150: 532:: CS1 maint: location missing publisher ( 3497: 1815: 930:CS1 maint: multiple names: authors list ( 760: 638: 636: 230:Learn how and when to remove this message 212:Learn how and when to remove this message 110:Learn how and when to remove this message 590: 557: 263:a treatment group versus a control group 73:This article includes a list of general 987: 679: 677: 269:, such as by a chance procedure (e.g., 3943: 3128:Kaplan–Meier estimator (product limit) 735: 633: 3471: 3201: 2768: 2515: 1814: 1584: 1201: 1145: 1137:Random assignment tool - Experimental 1135:Experimental Random Assignment Tool: 945:Illustrations of the Logic of Science 729: 416:Illustrations of the Logic of Science 3438: 3138:Accelerated failure time (AFT) model 1118:by Gleitman, Fridlund, and Reisberg. 674: 493: 491: 489: 487: 150:adding citations to reliable sources 121: 59: 18: 3839:Generalized randomized block design 3450: 2733:Analysis of variance (ANOVA, anova) 1585: 970:"On Small Differences in Sensation" 576:"On Small Differences in Sensation" 498:Witte, Robert S. (5 January 2017). 367: 13: 2828:Cochran–Mantel–Haenszel statistics 1454:Pearson product-moment correlation 814:Design and Analysis of Experiments 396: 79:it lacks sufficient corresponding 14: 3972: 3890:Sequential probability ratio test 1129: 1123:Journal of Experimental Education 484: 426:experiment on weight perception. 34:This article has multiple issues. 3913: 3815:Polynomial and rational modeling 3449: 3437: 3425: 3412: 3411: 3202: 126: 64: 23: 3087:Least-squares spectral analysis 451:advocated randomization in his 137:needs additional citations for 42:or discuss these issues on the 3582:Replication versus subsampling 2068:Mean-unbiased minimum-variance 1171: 955:A Theory of Probable Inference 473:Asymptotic theory (statistics) 420:A Theory of Probable Inference 333:pseudorandom number generators 308:, especially ones that can be 1: 3381:Geographic information system 2597:Simultaneous equations models 1070:Trudy Dehue (December 1997). 1043:American Journal of Education 684:Trudy Dehue (December 1997). 648:American Journal of Education 478: 355:Benefits of random assignment 3809:Response surface methodology 3717:Analysis of variance (Anova) 2564:Coefficient of determination 2175:Uniformly most powerful test 302:randomized controlled trials 7: 3879:Randomized controlled trial 3133:Proportional hazards models 3077:Spectral density estimation 3059:Vector autoregression (VAR) 2493:Maximum posterior estimator 1725:Randomized controlled trial 466: 10: 3977: 2893:Multivariate distributions 1313:Average absolute deviation 853:(Second ed.). Wiley. 405: 3898: 3767: 3662: 3595: 3505: 3407: 3361: 3298: 3251: 3214: 3210: 3197: 3169: 3151: 3118: 3109: 3067: 3014: 2975: 2924: 2915: 2881:Structural equation model 2836: 2793: 2789: 2764: 2723: 2689: 2643: 2610: 2572: 2539: 2535: 2511: 2451: 2360: 2279: 2243: 2234: 2217:Score/Lagrange multiplier 2202: 2155: 2100: 2026: 2017: 1827: 1823: 1810: 1769: 1743: 1695: 1650: 1632:Sample size determination 1597: 1593: 1580: 1484: 1439: 1413: 1395: 1351: 1303: 1223: 1214: 1210: 1197: 1179: 894:(First ed.). Wiley. 741:Dabrowska, Dorota M. 3865:Repeated measures design 3577:Restricted randomization 3376:Environmental statistics 2898:Elliptical distributions 2691:Generalized linear model 2620:Simple linear regression 2390:Hodges–Lehmann estimator 1847:Probability distribution 1756:Stochastic approximation 1318:Coefficient of variation 435:repeated-measures design 382:statistical significance 329:random number generators 253:technique for assigning 3036:Cross-correlation (XCF) 2644:Non-standard predictors 2078:Lehmann–ScheffĂ© theorem 1751:Adaptive clinical trial 292:are key aspects of the 275:random number generator 94:more precise citations. 3920:Mathematics portal 3682:Ordinary least squares 3432:Mathematics portal 3253:Engineering statistics 3161:Nelson–Aalen estimator 2738:Analysis of covariance 2625:Ordinary least squares 2549:Pearson product-moment 1953:Statistical functional 1864:Empirical distribution 1697:Controlled experiments 1426:Frequency distribution 1204:Descriptive statistics 962:Charles Sanders Peirce 882:Hinkelmann, Klaus and 845:Hinkelmann, Klaus and 808:Hinkelmann, Klaus and 745:Speed, Terence P. 568:Charles Sanders Peirce 439:randomized experiments 3956:Design of experiments 3517:Scientific experiment 3499:Design of experiments 3348:Population statistics 3290:System identification 3024:Autocorrelation (ACF) 2952:Exponential smoothing 2866:Discriminant analysis 2861:Canonical correlation 2725:Partition of variance 2587:Regression validation 2431:(Jonckheere–Terpstra) 2330:Likelihood-ratio test 2019:Frequentist inference 1931:Location–scale family 1852:Sampling distribution 1817:Statistical inference 1784:Cross-sectional study 1771:Observational studies 1730:Randomized experiment 1559:Stem-and-leaf display 1361:Central limit theorem 762:10.1214/ss/1177012031 327:, as well as between 294:design of experiments 3791:Fractional factorial 3271:Probabilistic design 2856:Principal components 2699:Exponential families 2651:Nonlinear regression 2630:General linear model 2592:Mixed effects models 2582:Errors and residuals 2559:Confounding variable 2461:Bayesian probability 2439:Van der Waerden test 2429:Ordered alternative 2194:Multiple comparisons 2073:Rao–Blackwellization 2036:Estimating equations 1992:Statistical distance 1710:Factorial experiment 1243:Arithmetic-Geometric 347:rigor, which affect 146:improve this article 3925:Statistical outline 3885:Sequential analysis 3850:Graeco-Latin square 3759:Multiple comparison 3706:Hierarchical model: 3343:Official statistics 3266:Methods engineering 2947:Seasonal adjustment 2715:Poisson regressions 2635:Bayesian regression 2574:Regression analysis 2554:Partial correlation 2526:Regression analysis 2125:Prediction interval 2120:Likelihood interval 2110:Confidence interval 2102:Interval estimation 2063:Unbiased estimators 1881:Model specification 1761:Up-and-down designs 1449:Partial correlation 1405:Index of dispersion 1323:Interquartile range 892:Experimental Design 749:Statistical Science 457:experimental design 418:" (1877–1878) and " 321:pseudorandomization 284:Random assignment, 161:"Random assignment" 3930:Statistical topics 3522:Statistical design 3363:Spatial statistics 3243:Medical statistics 3143:First hitting time 3097:Whittle likelihood 2748:Degrees of freedom 2743:Multivariate ANOVA 2676:Heteroscedasticity 2488:Bayesian estimator 2453:Bayesian inference 2302:Kolmogorov–Smirnov 2187:Randomization test 2157:Testing hypotheses 2130:Tolerance interval 2041:Maximum likelihood 1936:Exponential family 1869:Density estimation 1829:Statistical theory 1789:Natural experiment 1735:Scientific control 1652:Survey methodology 1338:Standard deviation 1039:Stephen M. Stigler 644:Stephen M. Stigler 325:quasirandomization 314:placebo-controlled 255:human participants 3938: 3937: 3825:Central composite 3723:Cochran's theorem 3677:Linear regression 3654:Nuisance variable 3567:Random assignment 3544:Experimental unit 3465: 3464: 3403: 3402: 3399: 3398: 3338:National accounts 3308:Actuarial science 3300:Social statistics 3193: 3192: 3189: 3188: 3185: 3184: 3120:Survival function 3105: 3104: 2967:Granger causality 2808:Contingency table 2783:Survival analysis 2760: 2759: 2756: 2755: 2612:Linear regression 2507: 2506: 2503: 2502: 2478:Credible interval 2447: 2446: 2230: 2229: 2046:Method of moments 1915:Parametric family 1876:Statistical model 1806: 1805: 1802: 1801: 1720:Random assignment 1642:Statistical power 1576: 1575: 1572: 1571: 1421:Contingency table 1391: 1390: 1258:Generalized/power 951:Charles S. Peirce 941:Charles S. Peirce 917:External link in 901:978-0-471-55177-5 884:Kempthorne, Oscar 860:978-0-471-72756-9 847:Kempthorne, Oscar 823:978-0-470-38551-7 810:Kempthorne, Oscar 511:978-1-119-25451-5 412:Charles S. Peirce 339:) is a matter of 306:clinical research 243:Random assignment 240: 239: 232: 222: 221: 214: 196: 120: 119: 112: 57: 3968: 3951:Causal inference 3918: 3917: 3855:Orthogonal array 3492: 3485: 3478: 3469: 3468: 3453: 3452: 3441: 3440: 3430: 3429: 3415: 3414: 3318:Crime statistics 3212: 3211: 3199: 3198: 3116: 3115: 3082:Fourier analysis 3069:Frequency domain 3049: 2996: 2962:Structural break 2922: 2921: 2871:Cluster analysis 2818:Log-linear model 2791: 2790: 2766: 2765: 2707: 2681:Homoscedasticity 2537: 2536: 2513: 2512: 2432: 2424: 2416: 2415:(Kruskal–Wallis) 2400: 2385: 2340:Cross validation 2325: 2307:Anderson–Darling 2254: 2241: 2240: 2212:Likelihood-ratio 2204:Parametric tests 2182:Permutation test 2165:1- & 2-tails 2056:Minimum distance 2028:Point estimation 2024: 2023: 1975:Optimal decision 1926: 1825: 1824: 1812: 1811: 1794:Quasi-experiment 1744:Adaptive designs 1595: 1594: 1582: 1581: 1459:Rank correlation 1221: 1220: 1212: 1211: 1199: 1198: 1166: 1159: 1152: 1143: 1142: 1116:Basic Psychology 1112: 1076: 1066: 1034: 981: 935: 928: 922: 921: 915: 913: 905: 878: 872: 864: 841: 835: 827: 804: 792: 774: 773: 764: 733: 727: 726: 690: 681: 672: 671: 640: 631: 630: 597: 588: 587: 564: 555: 554: 547: 538: 537: 531: 523: 495: 449:Ronald A. Fisher 368:Potential issues 349:evidence grading 247:random placement 235: 228: 217: 210: 206: 203: 197: 195: 154: 130: 122: 115: 108: 104: 101: 95: 90:this article by 81:inline citations 68: 67: 60: 49: 27: 26: 19: 3976: 3975: 3971: 3970: 3969: 3967: 3966: 3965: 3941: 3940: 3939: 3934: 3912: 3894: 3871:Crossover study 3862: 3860:Latin hypercube 3796:Plackett–Burman 3775: 3772: 3771: 3763: 3666: 3658: 3599: 3591: 3508: 3501: 3496: 3466: 3461: 3424: 3395: 3357: 3294: 3280:quality control 3247: 3229:Clinical trials 3206: 3181: 3165: 3153:Hazard function 3147: 3101: 3063: 3047: 3010: 3006:Breusch–Godfrey 2994: 2971: 2911: 2886:Factor analysis 2832: 2813:Graphical model 2785: 2752: 2719: 2705: 2685: 2639: 2606: 2568: 2531: 2530: 2499: 2443: 2430: 2422: 2414: 2398: 2383: 2362:Rank statistics 2356: 2335:Model selection 2323: 2281:Goodness of fit 2275: 2252: 2226: 2198: 2151: 2096: 2085:Median unbiased 2013: 1924: 1857:Order statistic 1819: 1798: 1765: 1739: 1691: 1646: 1589: 1587:Data collection 1568: 1480: 1435: 1409: 1387: 1347: 1299: 1216:Continuous data 1206: 1193: 1175: 1170: 1132: 1074: 929: 919: 918: 916: 907: 906: 902: 866: 865: 861: 829: 828: 824: 801: 777: 734: 730: 688: 682: 675: 641: 634: 598: 591: 565: 558: 549: 548: 541: 525: 524: 512: 496: 485: 481: 469: 408: 399: 397:Random sampling 390:null hypothesis 370: 357: 337:clinical trials 271:flipping a coin 259:animal subjects 236: 225: 224: 223: 218: 207: 201: 198: 155: 153: 143: 131: 116: 105: 99: 96: 86:Please help to 85: 69: 65: 28: 24: 17: 12: 11: 5: 3974: 3964: 3963: 3958: 3953: 3936: 3935: 3933: 3932: 3927: 3922: 3910: 3905: 3899: 3896: 3895: 3893: 3892: 3887: 3882: 3874: 3873: 3868: 3857: 3852: 3847: 3842: 3836: 3828: 3827: 3822: 3817: 3812: 3804: 3803: 3798: 3793: 3788: 3780: 3778: 3765: 3764: 3762: 3761: 3756: 3750: 3749: 3737: 3725: 3720: 3712: 3711: 3703: 3698: 3690: 3689: 3684: 3679: 3673: 3671: 3660: 3659: 3657: 3656: 3651: 3646: 3639: 3634: 3629: 3624: 3619: 3614: 3606: 3604: 3593: 3592: 3590: 3589: 3584: 3579: 3574: 3569: 3564: 3557:Optimal design 3552: 3551: 3546: 3541: 3529: 3524: 3519: 3513: 3511: 3503: 3502: 3495: 3494: 3487: 3480: 3472: 3463: 3462: 3460: 3459: 3447: 3435: 3421: 3408: 3405: 3404: 3401: 3400: 3397: 3396: 3394: 3393: 3388: 3383: 3378: 3373: 3367: 3365: 3359: 3358: 3356: 3355: 3350: 3345: 3340: 3335: 3330: 3325: 3320: 3315: 3310: 3304: 3302: 3296: 3295: 3293: 3292: 3287: 3282: 3273: 3268: 3263: 3257: 3255: 3249: 3248: 3246: 3245: 3240: 3235: 3226: 3224:Bioinformatics 3220: 3218: 3208: 3207: 3195: 3194: 3191: 3190: 3187: 3186: 3183: 3182: 3180: 3179: 3173: 3171: 3167: 3166: 3164: 3163: 3157: 3155: 3149: 3148: 3146: 3145: 3140: 3135: 3130: 3124: 3122: 3113: 3107: 3106: 3103: 3102: 3100: 3099: 3094: 3089: 3084: 3079: 3073: 3071: 3065: 3064: 3062: 3061: 3056: 3051: 3043: 3038: 3033: 3032: 3031: 3029:partial (PACF) 3020: 3018: 3012: 3011: 3009: 3008: 3003: 2998: 2990: 2985: 2979: 2977: 2976:Specific tests 2973: 2972: 2970: 2969: 2964: 2959: 2954: 2949: 2944: 2939: 2934: 2928: 2926: 2919: 2913: 2912: 2910: 2909: 2908: 2907: 2906: 2905: 2890: 2889: 2888: 2878: 2876:Classification 2873: 2868: 2863: 2858: 2853: 2848: 2842: 2840: 2834: 2833: 2831: 2830: 2825: 2823:McNemar's test 2820: 2815: 2810: 2805: 2799: 2797: 2787: 2786: 2762: 2761: 2758: 2757: 2754: 2753: 2751: 2750: 2745: 2740: 2735: 2729: 2727: 2721: 2720: 2718: 2717: 2701: 2695: 2693: 2687: 2686: 2684: 2683: 2678: 2673: 2668: 2663: 2661:Semiparametric 2658: 2653: 2647: 2645: 2641: 2640: 2638: 2637: 2632: 2627: 2622: 2616: 2614: 2608: 2607: 2605: 2604: 2599: 2594: 2589: 2584: 2578: 2576: 2570: 2569: 2567: 2566: 2561: 2556: 2551: 2545: 2543: 2533: 2532: 2529: 2528: 2523: 2517: 2509: 2508: 2505: 2504: 2501: 2500: 2498: 2497: 2496: 2495: 2485: 2480: 2475: 2474: 2473: 2468: 2457: 2455: 2449: 2448: 2445: 2444: 2442: 2441: 2436: 2435: 2434: 2426: 2418: 2402: 2399:(Mann–Whitney) 2394: 2393: 2392: 2379: 2378: 2377: 2366: 2364: 2358: 2357: 2355: 2354: 2353: 2352: 2347: 2342: 2332: 2327: 2324:(Shapiro–Wilk) 2319: 2314: 2309: 2304: 2299: 2291: 2285: 2283: 2277: 2276: 2274: 2273: 2265: 2256: 2244: 2238: 2236:Specific tests 2232: 2231: 2228: 2227: 2225: 2224: 2219: 2214: 2208: 2206: 2200: 2199: 2197: 2196: 2191: 2190: 2189: 2179: 2178: 2177: 2167: 2161: 2159: 2153: 2152: 2150: 2149: 2148: 2147: 2142: 2132: 2127: 2122: 2117: 2112: 2106: 2104: 2098: 2097: 2095: 2094: 2089: 2088: 2087: 2082: 2081: 2080: 2075: 2060: 2059: 2058: 2053: 2048: 2043: 2032: 2030: 2021: 2015: 2014: 2012: 2011: 2006: 2001: 2000: 1999: 1989: 1984: 1983: 1982: 1972: 1971: 1970: 1965: 1960: 1950: 1945: 1940: 1939: 1938: 1933: 1928: 1912: 1911: 1910: 1905: 1900: 1890: 1889: 1888: 1883: 1873: 1872: 1871: 1861: 1860: 1859: 1849: 1844: 1839: 1833: 1831: 1821: 1820: 1808: 1807: 1804: 1803: 1800: 1799: 1797: 1796: 1791: 1786: 1781: 1775: 1773: 1767: 1766: 1764: 1763: 1758: 1753: 1747: 1745: 1741: 1740: 1738: 1737: 1732: 1727: 1722: 1717: 1712: 1707: 1701: 1699: 1693: 1692: 1690: 1689: 1687:Standard error 1684: 1679: 1674: 1673: 1672: 1667: 1656: 1654: 1648: 1647: 1645: 1644: 1639: 1634: 1629: 1624: 1619: 1617:Optimal design 1614: 1609: 1603: 1601: 1591: 1590: 1578: 1577: 1574: 1573: 1570: 1569: 1567: 1566: 1561: 1556: 1551: 1546: 1541: 1536: 1531: 1526: 1521: 1516: 1511: 1506: 1501: 1496: 1490: 1488: 1482: 1481: 1479: 1478: 1473: 1472: 1471: 1466: 1456: 1451: 1445: 1443: 1437: 1436: 1434: 1433: 1428: 1423: 1417: 1415: 1414:Summary tables 1411: 1410: 1408: 1407: 1401: 1399: 1393: 1392: 1389: 1388: 1386: 1385: 1384: 1383: 1378: 1373: 1363: 1357: 1355: 1349: 1348: 1346: 1345: 1340: 1335: 1330: 1325: 1320: 1315: 1309: 1307: 1301: 1300: 1298: 1297: 1292: 1287: 1286: 1285: 1280: 1275: 1270: 1265: 1260: 1255: 1250: 1248:Contraharmonic 1245: 1240: 1229: 1227: 1218: 1208: 1207: 1195: 1194: 1192: 1191: 1186: 1180: 1177: 1176: 1169: 1168: 1161: 1154: 1146: 1140: 1139: 1131: 1130:External links 1128: 1127: 1126: 1119: 1113: 1093:10.1086/383850 1087:(4): 653–673. 1067: 1055:10.1086/444032 1035: 1007:10.1086/354775 1001:(3): 427–451. 985: 966:Joseph Jastrow 958: 948: 938: 937: 936: 900: 879: 859: 822: 805: 799: 776: 775: 728: 707:10.1086/383850 701:(4): 653–673. 673: 660:10.1086/444032 632: 619:10.1086/354775 613:(3): 427–451. 589: 572:Joseph Jastrow 556: 539: 510: 482: 480: 477: 476: 475: 468: 465: 407: 404: 398: 395: 369: 366: 356: 353: 310:double-blinded 300:. This is why 238: 237: 220: 219: 134: 132: 125: 118: 117: 72: 70: 63: 58: 32: 31: 29: 22: 15: 9: 6: 4: 3: 2: 3973: 3962: 3959: 3957: 3954: 3952: 3949: 3948: 3946: 3931: 3928: 3926: 3923: 3921: 3916: 3911: 3909: 3906: 3904: 3901: 3900: 3897: 3891: 3888: 3886: 3883: 3881: 3880: 3876: 3875: 3872: 3869: 3867: 3866: 3861: 3858: 3856: 3853: 3851: 3848: 3846: 3843: 3840: 3837: 3835: 3834: 3830: 3829: 3826: 3823: 3821: 3818: 3816: 3813: 3811: 3810: 3806: 3805: 3802: 3799: 3797: 3794: 3792: 3789: 3787: 3786: 3782: 3781: 3779: 3777: 3770: 3766: 3760: 3757: 3755: 3754:Compare means 3752: 3751: 3748: 3746: 3742: 3738: 3736: 3734: 3730: 3726: 3724: 3721: 3719: 3718: 3714: 3713: 3710: 3707: 3704: 3702: 3699: 3697: 3696: 3695:Random effect 3692: 3691: 3688: 3685: 3683: 3680: 3678: 3675: 3674: 3672: 3670: 3665: 3661: 3655: 3652: 3650: 3647: 3645: 3644: 3640: 3638: 3637:Orthogonality 3635: 3633: 3630: 3628: 3625: 3623: 3620: 3618: 3615: 3613: 3612: 3608: 3607: 3605: 3603: 3598: 3594: 3588: 3585: 3583: 3580: 3578: 3575: 3573: 3572:Randomization 3570: 3568: 3565: 3563: 3559: 3558: 3554: 3553: 3550: 3547: 3545: 3542: 3540: 3537: 3533: 3530: 3528: 3525: 3523: 3520: 3518: 3515: 3514: 3512: 3510: 3504: 3500: 3493: 3488: 3486: 3481: 3479: 3474: 3473: 3470: 3458: 3457: 3448: 3446: 3445: 3436: 3434: 3433: 3428: 3422: 3420: 3419: 3410: 3409: 3406: 3392: 3389: 3387: 3386:Geostatistics 3384: 3382: 3379: 3377: 3374: 3372: 3369: 3368: 3366: 3364: 3360: 3354: 3353:Psychometrics 3351: 3349: 3346: 3344: 3341: 3339: 3336: 3334: 3331: 3329: 3326: 3324: 3321: 3319: 3316: 3314: 3311: 3309: 3306: 3305: 3303: 3301: 3297: 3291: 3288: 3286: 3283: 3281: 3277: 3274: 3272: 3269: 3267: 3264: 3262: 3259: 3258: 3256: 3254: 3250: 3244: 3241: 3239: 3236: 3234: 3230: 3227: 3225: 3222: 3221: 3219: 3217: 3216:Biostatistics 3213: 3209: 3205: 3200: 3196: 3178: 3177:Log-rank test 3175: 3174: 3172: 3168: 3162: 3159: 3158: 3156: 3154: 3150: 3144: 3141: 3139: 3136: 3134: 3131: 3129: 3126: 3125: 3123: 3121: 3117: 3114: 3112: 3108: 3098: 3095: 3093: 3090: 3088: 3085: 3083: 3080: 3078: 3075: 3074: 3072: 3070: 3066: 3060: 3057: 3055: 3052: 3050: 3048:(Box–Jenkins) 3044: 3042: 3039: 3037: 3034: 3030: 3027: 3026: 3025: 3022: 3021: 3019: 3017: 3013: 3007: 3004: 3002: 3001:Durbin–Watson 2999: 2997: 2991: 2989: 2986: 2984: 2983:Dickey–Fuller 2981: 2980: 2978: 2974: 2968: 2965: 2963: 2960: 2958: 2957:Cointegration 2955: 2953: 2950: 2948: 2945: 2943: 2940: 2938: 2935: 2933: 2932:Decomposition 2930: 2929: 2927: 2923: 2920: 2918: 2914: 2904: 2901: 2900: 2899: 2896: 2895: 2894: 2891: 2887: 2884: 2883: 2882: 2879: 2877: 2874: 2872: 2869: 2867: 2864: 2862: 2859: 2857: 2854: 2852: 2849: 2847: 2844: 2843: 2841: 2839: 2835: 2829: 2826: 2824: 2821: 2819: 2816: 2814: 2811: 2809: 2806: 2804: 2803:Cohen's kappa 2801: 2800: 2798: 2796: 2792: 2788: 2784: 2780: 2776: 2772: 2767: 2763: 2749: 2746: 2744: 2741: 2739: 2736: 2734: 2731: 2730: 2728: 2726: 2722: 2716: 2712: 2708: 2702: 2700: 2697: 2696: 2694: 2692: 2688: 2682: 2679: 2677: 2674: 2672: 2669: 2667: 2664: 2662: 2659: 2657: 2656:Nonparametric 2654: 2652: 2649: 2648: 2646: 2642: 2636: 2633: 2631: 2628: 2626: 2623: 2621: 2618: 2617: 2615: 2613: 2609: 2603: 2600: 2598: 2595: 2593: 2590: 2588: 2585: 2583: 2580: 2579: 2577: 2575: 2571: 2565: 2562: 2560: 2557: 2555: 2552: 2550: 2547: 2546: 2544: 2542: 2538: 2534: 2527: 2524: 2522: 2519: 2518: 2514: 2510: 2494: 2491: 2490: 2489: 2486: 2484: 2481: 2479: 2476: 2472: 2469: 2467: 2464: 2463: 2462: 2459: 2458: 2456: 2454: 2450: 2440: 2437: 2433: 2427: 2425: 2419: 2417: 2411: 2410: 2409: 2406: 2405:Nonparametric 2403: 2401: 2395: 2391: 2388: 2387: 2386: 2380: 2376: 2375:Sample median 2373: 2372: 2371: 2368: 2367: 2365: 2363: 2359: 2351: 2348: 2346: 2343: 2341: 2338: 2337: 2336: 2333: 2331: 2328: 2326: 2320: 2318: 2315: 2313: 2310: 2308: 2305: 2303: 2300: 2298: 2296: 2292: 2290: 2287: 2286: 2284: 2282: 2278: 2272: 2270: 2266: 2264: 2262: 2257: 2255: 2250: 2246: 2245: 2242: 2239: 2237: 2233: 2223: 2220: 2218: 2215: 2213: 2210: 2209: 2207: 2205: 2201: 2195: 2192: 2188: 2185: 2184: 2183: 2180: 2176: 2173: 2172: 2171: 2168: 2166: 2163: 2162: 2160: 2158: 2154: 2146: 2143: 2141: 2138: 2137: 2136: 2133: 2131: 2128: 2126: 2123: 2121: 2118: 2116: 2113: 2111: 2108: 2107: 2105: 2103: 2099: 2093: 2090: 2086: 2083: 2079: 2076: 2074: 2071: 2070: 2069: 2066: 2065: 2064: 2061: 2057: 2054: 2052: 2049: 2047: 2044: 2042: 2039: 2038: 2037: 2034: 2033: 2031: 2029: 2025: 2022: 2020: 2016: 2010: 2007: 2005: 2002: 1998: 1995: 1994: 1993: 1990: 1988: 1985: 1981: 1980:loss function 1978: 1977: 1976: 1973: 1969: 1966: 1964: 1961: 1959: 1956: 1955: 1954: 1951: 1949: 1946: 1944: 1941: 1937: 1934: 1932: 1929: 1927: 1921: 1918: 1917: 1916: 1913: 1909: 1906: 1904: 1901: 1899: 1896: 1895: 1894: 1891: 1887: 1884: 1882: 1879: 1878: 1877: 1874: 1870: 1867: 1866: 1865: 1862: 1858: 1855: 1854: 1853: 1850: 1848: 1845: 1843: 1840: 1838: 1835: 1834: 1832: 1830: 1826: 1822: 1818: 1813: 1809: 1795: 1792: 1790: 1787: 1785: 1782: 1780: 1777: 1776: 1774: 1772: 1768: 1762: 1759: 1757: 1754: 1752: 1749: 1748: 1746: 1742: 1736: 1733: 1731: 1728: 1726: 1723: 1721: 1718: 1716: 1713: 1711: 1708: 1706: 1703: 1702: 1700: 1698: 1694: 1688: 1685: 1683: 1682:Questionnaire 1680: 1678: 1675: 1671: 1668: 1666: 1663: 1662: 1661: 1658: 1657: 1655: 1653: 1649: 1643: 1640: 1638: 1635: 1633: 1630: 1628: 1625: 1623: 1620: 1618: 1615: 1613: 1610: 1608: 1605: 1604: 1602: 1600: 1596: 1592: 1588: 1583: 1579: 1565: 1562: 1560: 1557: 1555: 1552: 1550: 1547: 1545: 1542: 1540: 1537: 1535: 1532: 1530: 1527: 1525: 1522: 1520: 1517: 1515: 1512: 1510: 1509:Control chart 1507: 1505: 1502: 1500: 1497: 1495: 1492: 1491: 1489: 1487: 1483: 1477: 1474: 1470: 1467: 1465: 1462: 1461: 1460: 1457: 1455: 1452: 1450: 1447: 1446: 1444: 1442: 1438: 1432: 1429: 1427: 1424: 1422: 1419: 1418: 1416: 1412: 1406: 1403: 1402: 1400: 1398: 1394: 1382: 1379: 1377: 1374: 1372: 1369: 1368: 1367: 1364: 1362: 1359: 1358: 1356: 1354: 1350: 1344: 1341: 1339: 1336: 1334: 1331: 1329: 1326: 1324: 1321: 1319: 1316: 1314: 1311: 1310: 1308: 1306: 1302: 1296: 1293: 1291: 1288: 1284: 1281: 1279: 1276: 1274: 1271: 1269: 1266: 1264: 1261: 1259: 1256: 1254: 1251: 1249: 1246: 1244: 1241: 1239: 1236: 1235: 1234: 1231: 1230: 1228: 1226: 1222: 1219: 1217: 1213: 1209: 1205: 1200: 1196: 1190: 1187: 1185: 1182: 1181: 1178: 1174: 1167: 1162: 1160: 1155: 1153: 1148: 1147: 1144: 1138: 1134: 1133: 1124: 1120: 1117: 1114: 1110: 1106: 1102: 1098: 1094: 1090: 1086: 1082: 1081: 1073: 1068: 1064: 1060: 1056: 1052: 1048: 1044: 1040: 1036: 1032: 1028: 1024: 1020: 1016: 1012: 1008: 1004: 1000: 996: 995: 990: 986: 984: 979: 975: 971: 967: 963: 959: 956: 952: 949: 947:" (1877–1878) 946: 942: 939: 933: 926: 911: 903: 897: 893: 891: 885: 880: 876: 870: 862: 856: 852: 848: 843: 842: 839: 833: 825: 819: 815: 811: 806: 802: 800:0-387-98578-6 796: 791: 790: 788: 779: 778: 772: 768: 763: 758: 754: 750: 746: 742: 738: 737:Neyman, Jerzy 732: 724: 720: 716: 712: 708: 704: 700: 696: 695: 687: 680: 678: 669: 665: 661: 657: 653: 649: 645: 639: 637: 628: 624: 620: 616: 612: 608: 607: 602: 596: 594: 585: 581: 577: 573: 569: 563: 561: 552: 546: 544: 535: 529: 521: 517: 513: 507: 503: 502: 494: 492: 490: 488: 483: 474: 471: 470: 464: 462: 458: 454: 450: 446: 442: 440: 436: 432: 427: 425: 421: 417: 413: 403: 394: 391: 387: 383: 379: 374: 365: 361: 352: 350: 346: 342: 338: 334: 330: 326: 322: 317: 315: 311: 307: 304:are vital in 303: 299: 295: 291: 287: 282: 280: 276: 272: 268: 267:randomization 264: 260: 256: 252: 248: 244: 234: 231: 216: 213: 205: 194: 191: 187: 184: 180: 177: 173: 170: 166: 163: â€“  162: 158: 157:Find sources: 151: 147: 141: 140: 135:This article 133: 129: 124: 123: 114: 111: 103: 93: 89: 83: 82: 76: 71: 62: 61: 56: 54: 47: 46: 41: 40: 35: 30: 21: 20: 3877: 3863: 3845:Latin square 3831: 3807: 3783: 3744: 3740: 3733:multivariate 3732: 3728: 3715: 3693: 3641: 3609: 3566: 3555: 3454: 3442: 3423: 3416: 3328:Econometrics 3278: / 3261:Chemometrics 3238:Epidemiology 3231: / 3204:Applications 3046:ARIMA model 2993:Q-statistic 2942:Stationarity 2838:Multivariate 2781: / 2777: / 2775:Multivariate 2773: / 2713: / 2709: / 2483:Bayes factor 2382:Signed rank 2294: 2268: 2260: 2248: 1943:Completeness 1779:Cohort study 1719: 1677:Opinion poll 1612:Missing data 1599:Study design 1554:Scatter plot 1476:Scatter plot 1469:Spearman's ρ 1431:Grouped data 1122: 1115: 1084: 1078: 1049:(1): 60–70. 1046: 1042: 998: 992: 989:Hacking, Ian 977: 973: 920:|title= 887: 850: 813: 786: 784: 752: 748: 731: 698: 692: 654:(1): 60–70. 651: 647: 610: 604: 583: 579: 500: 445:Jerzy Neyman 443: 428: 409: 400: 388:against the 375: 371: 362: 358: 341:trial design 318: 283: 251:experimental 246: 242: 241: 226: 208: 199: 189: 182: 175: 168: 156: 144:Please help 139:verification 136: 106: 97: 78: 50: 43: 37: 36:Please help 33: 3961:Experiments 3820:Box–Behnken 3701:Mixed model 3632:Confounding 3627:Interaction 3617:Effect size 3587:Sample size 3456:WikiProject 3371:Cartography 3333:Jurimetrics 3285:Reliability 3016:Time domain 2995:(Ljung–Box) 2917:Time-series 2795:Categorical 2779:Time-series 2771:Categorical 2706:(Bernoulli) 2541:Correlation 2521:Correlation 2317:Jarque–Bera 2289:Chi-squared 2051:M-estimator 2004:Asymptotics 1948:Sufficiency 1715:Interaction 1627:Replication 1607:Effect size 1564:Violin plot 1544:Radar chart 1524:Forest plot 1514:Correlogram 1464:Kendall's τ 601:Ian Hacking 345:statistical 298:confounding 290:controlling 92:introducing 3945:Categories 3776:randomized 3774:Completely 3745:covariance 3507:Scientific 3323:Demography 3041:ARMA model 2846:Regression 2423:(Friedman) 2384:(Wilcoxon) 2322:Normality 2312:Lilliefors 2259:Student's 2135:Resampling 2009:Robustness 1997:divergence 1987:Efficiency 1925:(monotone) 1920:Likelihood 1837:Population 1670:Stratified 1622:Population 1441:Dependence 1397:Count data 1328:Percentile 1305:Dispersion 1238:Arithmetic 1173:Statistics 890:Assignment 789:: Analysis 501:Statistics 479:References 279:systematic 172:newspapers 75:references 39:improve it 3785:Factorial 3669:inference 3649:Covariate 3611:Treatment 3597:Treatment 2704:Logistic 2471:posterior 2397:Rank sum 2145:Jackknife 2140:Bootstrap 1958:Bootstrap 1893:Parameter 1842:Statistic 1637:Statistic 1549:Run chart 1534:Pie chart 1529:Histogram 1519:Fan chart 1494:Bar chart 1376:L-moments 1263:Geometric 1063:143685203 910:cite book 869:cite book 832:cite book 739:(1990) , 668:143685203 528:cite book 520:956984834 45:talk page 3908:Category 3903:Glossary 3709:Bayesian 3687:Bayesian 3643:Blocking 3622:Contrast 3602:blocking 3562:Bayesian 3549:Blinding 3539:validity 3536:external 3532:Internal 3418:Category 3111:Survival 2988:Johansen 2711:Binomial 2666:Isotonic 2253:(normal) 1898:location 1705:Blocking 1660:Sampling 1539:Q–Q plot 1504:Box plot 1486:Graphics 1381:Skewness 1371:Kurtosis 1343:Variance 1273:Heronian 1268:Harmonic 1109:23526321 1031:52201011 980:: 73–83. 968:(1885). 957:" (1883) 886:(2005). 849:(2008). 812:(2008). 723:23526321 627:52201011 586:: 73–83. 574:(1885). 467:See also 286:blinding 265:) using 202:May 2016 100:May 2016 3801:Taguchi 3769:Designs 3527:Control 3444:Commons 3391:Kriging 3276:Process 3233:studies 3092:Wavelet 2925:General 2092:Plug-in 1886:L space 1665:Cluster 1366:Moments 1184:Outline 1101:9519574 1023:1013489 771:1092986 715:9519574 431:blinded 424:Jastrow 406:History 273:) or a 186:scholar 88:improve 3841:(GRBD) 3741:Ancova 3729:Manova 3664:Models 3509:method 3313:Census 2903:Normal 2851:Manova 2671:Robust 2421:2-way 2413:1-way 2251:-test 1922:  1499:Biplot 1290:Median 1283:Lehmer 1225:Center 1107:  1099:  1061:  1029:  1021:  1015:234674 1013:  898:  857:  820:  797:  769:  721:  713:  666:  625:  518:  508:  323:, and 288:, and 249:is an 188:  181:  174:  167:  159:  77:, but 3833:Block 2937:Trend 2466:prior 2408:anova 2297:-test 2271:-test 2263:-test 2170:Power 2115:Pivot 1908:shape 1903:scale 1353:Shape 1333:Range 1278:Heinz 1253:Cubic 1189:Index 1105:S2CID 1075:(PDF) 1059:S2CID 1027:S2CID 1011:JSTOR 719:S2CID 689:(PDF) 664:S2CID 623:S2CID 386:means 193:JSTOR 179:books 3667:and 3600:and 3534:and 3170:Test 2370:Sign 2222:Wald 1295:Mode 1233:Mean 1097:PMID 1080:Isis 994:Isis 964:and 932:link 925:help 896:ISBN 875:link 855:ISBN 838:link 818:ISBN 795:ISBN 711:PMID 694:Isis 606:Isis 570:and 534:link 516:OCLC 506:ISBN 461:1935 453:book 414:in " 378:mean 343:and 331:and 312:and 165:news 2350:BIC 2345:AIC 1089:doi 1051:doi 1047:101 1003:doi 953:, " 943:, " 757:doi 703:doi 656:doi 652:101 615:doi 463:). 455:on 257:or 245:or 148:by 3947:: 3560:: 1103:. 1095:. 1085:88 1083:. 1077:. 1057:. 1045:. 1025:. 1019:MR 1017:. 1009:. 999:79 997:. 976:. 972:. 914:: 912:}} 908:{{ 871:}} 867:{{ 834:}} 830:{{ 767:MR 765:, 751:, 743:; 717:. 709:. 699:88 697:. 691:. 676:^ 662:. 650:. 635:^ 621:. 611:79 609:. 592:^ 582:. 578:. 559:^ 542:^ 530:}} 526:{{ 514:. 486:^ 433:, 316:. 48:. 3747:) 3743:( 3735:) 3731:( 3491:e 3484:t 3477:v 2295:G 2269:F 2261:t 2249:Z 1968:V 1963:U 1165:e 1158:t 1151:v 1111:. 1091:: 1065:. 1053:: 1033:. 1005:: 978:3 934:) 927:) 923:( 904:. 877:) 863:. 840:) 826:. 803:. 787:I 759:: 753:5 725:. 705:: 670:. 658:: 629:. 617:: 584:3 553:. 536:) 522:. 459:( 233:) 227:( 215:) 209:( 204:) 200:( 190:· 183:· 176:· 169:· 142:. 113:) 107:( 102:) 98:( 84:. 55:) 51:(

Index

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references
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verification
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adding citations to reliable sources
"Random assignment"
news
newspapers
books
scholar
JSTOR
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experimental
human participants
animal subjects
a treatment group versus a control group
randomization
flipping a coin
random number generator
systematic
blinding
controlling

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