Wilcoxon Test Results

Question

Hello everyone,

I am using Wilcoxon Test for comparing the mean differences between two groups. I do understand the meaning of Prob>ChiSq, however would someone please tell if it relevant for one-sided test or two-sided?

If it is relevant to two-sided test, how can we calculate the probability for one-sided test.

Thank you,

Ne

NeF · Answer

Hi,

thank you!

Mark_Bailey · Answer

(Note that this edit corrects and clarifies my original response. A colleague made me reconsider.)

The chi square test, like the t test, can be performed as a lower-tailed, upper-tailed, or two-tailed test. The Wilcoxon test is an upper-tailed test.