The purpose of this study was to compare the statistical power of a variety of exact tests in the 2 x C ordered categorical contingency table using StatXact software. The Wilcoxon Rank Sum, Expected Nonnal Scores, Savage Scores (or its Log Rank equivalent), and Permutation tests were studied. Results indicated that the procedures were nearly the same in terms of comparative statistical power.
"Asymptotic And Exact Tests In 2 x C Ordered Categorical Contingency Tables With StatXact 2.0 - 4.0,"
Journal of Modern Applied Statistical Methods: Vol. 1
, Article 23.
Available at: http://digitalcommons.wayne.edu/jmasm/vol1/iss1/23