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Can you run a Nonparametric ANCOVA?

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New Contributor
Posts: 2

Can you run a Nonparametric ANCOVA?

I am having an issue trying to find a way to code a nonparametric ANCOVA, and I am wondering if its even possible in SAS. I have 1 fixed effect and 1 covariate. The assumption of normality is met, however the assumption of homogeneity of errors is not met (p-value for fixed effect = 0.0432 using Levene's test). I have tried several transformations (log, ln, power, squareroot, arcsine squareroot, etc.) and have not been able to meet the assumptions. I was hoping to do a ranked analysis, however I have not been able to figure out how to code it. Any assistance would be greatly appreciated!

 

Cheers.

Grand Advisor
Posts: 9,320

Re: Can you run a Nonparametric ANCOVA?

Check PROC NPAR1WAY 's Savage Test in the last example of its documentation.

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