[R] Looking for transformation to overcome heterogeneity of variances

From: Paul Smith <phhs80_at_gmail.com>
Date: Thu 03 Aug 2006 - 23:33:28 EST


Dear All

My data consists in 96 groups, each one with 10 observations. Levene's test suggests that the variances are not equal, and therefore I have tried to apply the classical transformations to have homocedasticity in order to be able to use ANOVA. Unfortunately, no transformation that I have used transforms my data into data with homocedasticity. The histogram of variances is at

http://phhs80.googlepages.com/hist1.png

Is someone able to suggest to me a transformation to overcome the problem of heterocedasticity?

Thanks in advance,

Paul



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