The performance of the pseudo-median based procedure is examined in terms of controlling Type I error for a two independent groups test. The procedure is a modification of the one-sample Wilcoxon statistic using the pseudo-median of differences between group values as the central measure of location. The proposed procedure was shown to have good control of Type I error rates under the study conditions regardless of distribution type.
Ahad, Nor Aishah; Othman, Abdul Rahman; and Yahaya, Sharipah Soaad Syed
"Type I Error Rates of the Two-Sample Pseudo-Median Procedure,"
Journal of Modern Applied Statistical Methods: Vol. 10
, Article 3.
Available at: http://digitalcommons.wayne.edu/jmasm/vol10/iss2/3