Small Sample Properties of the Wilcoxon Signed Rank Test with Discontinuous and Dependent Observations Volume 1 Jena Economic Research Papers 2007-07-05 2007 2007 Wilcoxon signed rank test ties dependent observations size and power This Monte-Carlo study investigates sensitivity of the Wilcoxon signed rank test to certain assumption violations in small samples. Emphasis is put on within-sample-dependence, between-sample dependence, and the presence of ties. Our results show that both assumption violations induce severe size distortions and entail power losses. Surprisingly, these consequences do vary substantially with other properties the data may display. Results provided are particularly relevant for experimental settings where ties and within-sample dependence are frequently observed. 2007-032 jportal_jpjournal_00000016 2007-07-05T07:50:58.566Z 2010-12-17T11:53:28.382Z