[R] Linear Trend in Residiuals From lme
Rick Bilonick
rab45+ at pitt.edu
Wed Aug 9 21:43:12 CEST 2006
I'm fitting a mixed effects model:
fit.1 <- lme(y~x,random=~1|id,data=df)
There are two different observations for each id for both x and y. When
I use plot(fit.1), there is a strong increasing linear trend in the
residuals versus the fitted values (with no outliers). This also happens
if I use random=~x|id. Am I specifying something incorrectly?
Rick B.
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