Mann Whitney U Test output

Discuss the jamovi platform, possible improvements, etc.

by scro1461 » Mon Mar 29, 2021 2:09 pm

I have recently run a Mann Whitney U test. It states that the mean difference (although it should be the median difference is 0.202.

But looking at the descriptions table, the median difference should be 0.553. The problem is that the number in the overall test output does not correlate either with the mean difference or median difference calculated from the median and mean from the descriptive table.

Maybe I am missing something.

Have included an image of the output:

Screenshot 2021-03-29 at 15.00.05.png
Output
Screenshot 2021-03-29 at 15.00.05.png (64.77 KiB) Viewed 1003 times
scro1461
 
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by jonathon » Fri Apr 02, 2021 10:08 pm

hi,

we rely on R to perform these calculations, so you may need to investigate there. here is the code we use:

https://github.com/jamovi/jmv/blob/master/R/ttestis.b.R#L254-L272

kind regards

jonathon
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