Search results for author:"Rand_R_Wilcox"
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Psychometrika Vol. 56, No. 3 (1991) pp. 381–95
New methods for comparing the medians corresponding to independent treatment groups are suggested. Procedures are based on the estimator of F. Harrell and C. Davis in conjunction with a modification and extension of the bootstrap calibration...
Psychometrika Vol. 58, No. 1 (1993) pp. 71–78
Modifications are proposed to the recently developed method of comparing one-step M-estimators of location corresponding to two independent groups that provides good control over the probability of Type I error even for unequal sample size, unequal...
Journal of Educational Measurement Vol. 24, No. 3 (1987) pp. 263–69
Four procedures are discussed for obtaining a confidence interval when answer-until-correct scoring is used in multiple choice tests. Simulated data show that the choice of procedure depends upon sample size. (GDC)
Journal of Educational Statistics Vol. 11, No. 4 (1986) pp. 263–74
This paper investigates three methods for comparing medians rather than means in studying two independent treatment groups. The method that gave the best results is based on a normal approximation of the distribution of the sample median where the...
A Generally Robust Approach for Testing Hypotheses and Setting Confidence Intervals for Effect Sizes
Psychological Methods Vol. 13, No. 2 (June 2008) pp. 110–129
Standard least squares analysis of variance methods suffer from poor power under arbitrarily small departures from normality and fail to control the probability of a Type I error when standard assumptions are violated. This article describes a...