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05-29-2017 11:33 AM

If sample size is not equal, is it possible to conduct comparison by wilcoxon rank sum test? Thank you!

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11-08-2017
10:27 PM

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Posted in reply to Jerrynetwork

05-29-2017 12:25 PM

Yes. You can find a discussion (with references) at: https://stats.stackexchange.com/questions/40342/mann-whitney-u-test-with-unequal-sample-sizes

Art, CEO, AnalystFinder.com

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Solution

11-08-2017
10:27 PM

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Posted in reply to Jerrynetwork

05-29-2017 12:25 PM

Yes. You can find a discussion (with references) at: https://stats.stackexchange.com/questions/40342/mann-whitney-u-test-with-unequal-sample-sizes

Art, CEO, AnalystFinder.com

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Posted in reply to art297

05-29-2017 01:00 PM

Thank you!

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Posted in reply to Jerrynetwork

05-29-2017 12:32 PM

Looking at the wikipedia entry for Wilcoxon Signed Rank Test, it states that one of the assumption is "Data is paired and comes from the same population", i.e. the two "samples" must be of the same size. But it also includes a reference to the related Mann-Whitney U Test (also call the Mann-Whitney-Wilcoxon Rank-sum test). which does NOT require identical sample size.

Take a look at the NPAR1WAY procedure, example 83.3 "Exact Wilcoxon Two-Sample Test".

Note: This is not based on my expertise - other than using wikipedia, and searching for 'mann-whitney' in sas documentation.

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Posted in reply to mkeintz

05-29-2017 01:06 PM

Thank you for the response!