Thursday, 5 September 2013

Wilcoxon Signed Rank Test Table


Below is a table of the number of samples against the critical value of the statistic $W$ for the Wilcoxon Signed Rank Test. The alpha level is 5%, for a two-tailed test.  Sample values up to 25 are shown - for more than 25 samples, calculating the z-score and the resulting p-value will yield accurate enough results. 



Number or Samples W(critical)
6 0
7 2
8 4
9 6
10 8
11 11
12 14
13 17
14 21
15 25
16 30
17 35
18 40
19 46
20 52
21 58
22 65
23 73
24 81
25 89