Mann Whitney U Test output

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scro1461
Posts: 17
Joined: Thu Nov 26, 2020 12:23 pm

Mann Whitney U Test output

Post by scro1461 »

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:
Output
Output
Screenshot 2021-03-29 at 15.00.05.png (64.77 KiB) Viewed 5777 times
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jonathon
Posts: 2613
Joined: Fri Jan 27, 2017 10:04 am

Re: Mann Whitney U Test output

Post by jonathon »

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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