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#### Article Title

Comparing Two Independent Groups Via a Quantile Generalization of the Wilcoxon-Mann-Whitney Test

#### Abstract

The Wilcoxon-Mann-Whitney test, as well as modern improvements, are based in part on an estimate of p = P(D < 0), where D = X−Y and X and Y are independent random variables; a common goal is to test H_{0}: p = 0.5. This corresponds to testing H_{0}: ξ_{0.5}, where ξ_{0.5} is the 0.5 quantile of the distribution of D. If the distributions associated with X and Y do not differ, then D has a symmetric distribution about zero. In particular, ξ_{q} + ξ_{1-q} = 0 for any q ≤ 0.5, where ξ_{q} is the q^{th} quantile. Methods aimed at testing H_{0}: p = 0.5 are generalized by suggesting a method for testing H_{0}: ξ_{q} + ξ_{1-q} = 0, q < 0.5

#### Recommended Citation

Wilcox, Rand R.
(2012)
"Comparing Two Independent Groups Via a Quantile Generalization of the Wilcoxon-Mann-Whitney Test,"
*Journal of Modern Applied Statistical Methods*:
Vol. 11:
Iss.
2, Article 2.

Available at:
http://digitalcommons.wayne.edu/jmasm/vol11/iss2/2