topic Re: What are requirements to perform Wilcoxon test in JMP in Discussions

What are requirements to perform Wilcoxon test in JMP

Fufen — Thu, 20 Jun 2024 13:55:04 GMT

Are there any requirements to data distribution shape or variance to perform Wilcoxon test in JMP?

Thanks

Re: What are requirements to perform Wilcoxon test in JMP

Mark_Bailey — Thu, 20 Jun 2024 14:29:16 GMT

This is a non-parametric test, so it makes no assumptions about the distribution. It is 'distribution-free.'

Re: What are requirements to perform Wilcoxon test in JMP

txnelson — Thu, 20 Jun 2024 14:57:42 GMT

Are your groups matched pairs, or are they from independent groups?

Re: What are requirements to perform Wilcoxon test in JMP

Fufen — Mon, 24 Jun 2024 08:09:24 GMT

The data are from independent groups.

I would like to know if any requirements for variance between the two groups, equal vs non-equal?

Re: What are requirements to perform Wilcoxon test in JMP

txnelson — Mon, 24 Jun 2024 11:38:37 GMT

The data should be of equal variance and the measurement system should be of equal interval, but the distribution does not have to be normally distributed.

Re: What are requirements to perform Wilcoxon test in JMP

Fufen — Mon, 24 Jun 2024 11:50:48 GMT

Thanks. Which function in JMP could be used if the data are not normal distribution and variance not equal?

Re: What are requirements to perform Wilcoxon test in JMP

peng_liu — Tue, 02 Jul 2024 03:08:24 GMT

It surprises me that a search for Wilcoxon in documentation returns multiple hits:

https://www.jmp.com/support/help/en/18.0/#search/Wilcoxon

I only knew may be a couple.

A read of some of them reveals two questions: what you data look like, and what is your hypothesis?

Here are some of the relevant hits:

https://www.jmp.com/support/help/en/18.0/index.shtml#page/jmp/statistical-details-for-the-wilcoxon-signed-rank-test.shtml

https://www.jmp.com/support/help/en/18.0/index.shtml#page/jmp/example-of-the-nonparametric-wilcoxon-test.shtml

https://www.jmp.com/support/help/en/18.0/index.shtml#page/jmp/equivalence-test-reports.shtml

https://www.jmp.com/support/help/en/18.0/index.shtml#page/jmp/statistical-details-for-survival-analysis.shtml

All responses from Mark and Jim are relevant. But I think you need to read through those documentations and find the one that is appropriate for your situation.