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Fufen
Level II

What are requirements to perform Wilcoxon test in JMP

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

Thanks

5 REPLIES 5

Re: What are requirements to perform Wilcoxon test in JMP

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

txnelson
Super User

Re: What are requirements to perform Wilcoxon test in JMP

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

Jim
Fufen
Level II

Re: What are requirements to perform Wilcoxon test in JMP

The data are from independent groups. 

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

txnelson
Super User

Re: What are requirements to perform Wilcoxon test in JMP

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.

 

Jim
Fufen
Level II

Re: What are requirements to perform Wilcoxon test in JMP

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