https://communities.sas.com/t5/SAS-Studio/Can-you-run-a-Nonparametric-ANCOVA/m-p/346611#M2202 <P>Check PROC NPAR1WAY 's Savage Test in the last example of its documentation.</P> Mon, 03 Apr 2017 10:15:38 GMT Ksharp 2017-04-03T10:15:38Z https://communities.sas.com/t5/SAS-Studio/Can-you-run-a-Nonparametric-ANCOVA/m-p/346585#M2201 <P>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!</P><P>&nbsp;</P><P>Cheers.</P> Mon, 03 Apr 2017 06:59:51 GMT https://communities.sas.com/t5/SAS-Studio/Can-you-run-a-Nonparametric-ANCOVA/m-p/346585#M2201 ijhgo_uynrtpwiavnckml 2017-04-03T06:59:51Z https://communities.sas.com/t5/SAS-Studio/Can-you-run-a-Nonparametric-ANCOVA/m-p/346611#M2202 <P>Check PROC NPAR1WAY 's Savage Test in the last example of its documentation.</P> Mon, 03 Apr 2017 10:15:38 GMT https://communities.sas.com/t5/SAS-Studio/Can-you-run-a-Nonparametric-ANCOVA/m-p/346611#M2202 Ksharp 2017-04-03T10:15:38Z