Re: [R] Looking for transformation to overcome heterogeneity of variances

From: Paul Smith <>
Date: Fri 04 Aug 2006 - 20:21:32 EST

Thanks to all contributors for the fruitfulness of this discussion. I am speculating about a simpler solution: to use a non-parametric approach. To avoid the requirement of having normal residuals, Frank Harrell has suggested here the following non-parametric procedure:

library(Design) # also requires library(Hmisc) f <- lrm(y ~ a*b*c*d)

Could someone please tell me whether that also works when there is no homoscedasticity? What are the assumptions of that method?

Paul mailing list PLEASE do read the posting guide and provide commented, minimal, self-contained, reproducible code. Received on Fri Aug 04 20:25:39 2006

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