[R] unequal variance assumption for lme (mixed effect model)

From: shirley zhang <shirley0818_at_gmail.com>
Date: Wed, 27 Jun 2007 21:55:31 -0400


Dear Douglas and R-help,

Does lme assume normal distribution AND equal variance among groups like anova() does? If it does, is there any method like unequal variance T-test (Welch T) in lme when each group has unequal variance in my data?

Thanks,
Shirley



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