Wilcoxon Z Score. We think this guideline is. The effect size r is calculated as Z statistic divided by the square root of the sample size N ZsqrtN.
When you have a sample size that is greater than approximately 30 the Wilcoxon Signed-Ranks statistic follows the z distribution. The Z value is extracted from either coinwilcoxsign_test case of one- or paired-samples test or coinwilcox_test case of independent two-samples test. Two-Sided Pr S - Mean 01054.
Normally the BIGGER the test statistic the less likely it is to have occurred by chance.
From these we calculate a z-score of 257 cell K12 which yields a p-value cell K14 of01 two-tail test which is less than α 05 and so once again we reject the null hypothesis. This handles ties well also. When you have a sample size that is greater than approximately 30 the Wilcoxon Signed-Ranks statistic follows the z distribution. If the groups are evenly distributed then the z-score will be closer to 0.
