Programming the statistical procedures from SAS

Friedman test and Survival Curves

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SAS Employee
Posts: 1

Friedman test and Survival Curves

Hallo colleagues!

I have some questions about SAS/STAT Procedures:
1) I can’t find in SAS/STAT Multifactor Friedman test ANOVA. I see one-way ANOVA test, is there multifactor(and how can I get it)?
2) I have more than 4 survival curves(hypothesis that there is no differences). I can reject or support hypothesis? But what method do I need to perform what curves have differences?


Many Thanks,

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Balashova

Grand Advisor
Posts: 16,940

Re: Friedman test and Survival Curves

For 2) You can do a pairwise test to see which are truely different.  Or you can switch to a parametric method, such as PROC PHREG (Cox regression model) that will provide more details on which levels are different.

Respected Advisor
Posts: 2,655

Re: Friedman test and Survival Curves

For 1, I'd like more information, but as a start, you could transform the data to ranks and use PROC GLM.  Note that the data must be balanced for this approach to work.  In addition, there cannot be any interactions between main effects/factors.  With more information, it may be possible to suggest an analysis that is not so restrictive, especially if you are doing Friedman's because of "lack of normality".

Steve Denham

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