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

From: Paul Smith <phhs80_at_gmail.com>
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)
f
anova(f)

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

Paul



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