where to find z score and df in multiple comparison ?
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Sang Hoon Kim
on 8 May 2021
Edited: Sang Hoon Kim
on 11 May 2021
Dear
I would like to get z value and degree of freedom in the multiple comparison.
For example,
[p,table,stats] = kruskalwallis(data,groups);
Then, I used multicompare function.
[c,m,h,nms] = multcompare(stats,'alpha',.05,'ctype','dunn-sidak');
1 2 107.358736884486 149.713883016209 192.069029147931 0
1 3 120.836759163490 153.690374387319 186.543989611148 0
2 3 -32.2920513577527 3.97649137111020 40.2450340999731 0.991192034848183
here is the result for c, and 6th column would be p value.
For each comparison, where to get z value?
(z value for 1-2 / 1-3 and 2-3)
I really appreciate it if someone could help.
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Accepted Answer
Scott MacKenzie
on 8 May 2021
The degrees of freedom is n -1, when n is the number of columns in the data set:
[p,table,stats] = kruskalwallis(data,groups);
df = size(data,1) - 1 ;
Above, it is calculated from the data. You can also use n from the stats structure:
df = stats.n - 1;
9 Comments
Scott MacKenzie
on 11 May 2021
Sorry, but I don't know about this. You might consider posting another question, specifically asking about standardized z-scores from a Kruskal Wallis test. If you do, don't mention degrees of freedom. :)
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