Displaying 1 result from an estimated 1 matches for "sigma_pop".
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sigma_pos
2007 Oct 26
1
2-way Factorial with random factors
..., I typed:
fm3 <- lmer(fruto~(1|pop) + (1|spp) + (1|pop:spp), data=p1)
During calculations I get an error which indicates that the variance
components for pop and pop:spp are almost zero. The summary output
presents variance components that do not resemble the manually
estimated values (eg. sigma_pop = 3650 vs sigma_pop(reml) = 7840). If
I conduct the analysis in SAS, with GLM and the random option, I get
correct estimates of variance components.
After reading a couple of help files, it looks like I need a fixed
component, which I don?t know how to code (dummy coding?).
My specific questio...