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2012 May 03
2
Very small random effect estimation in lmer but not in stata xtmixed
Hi folks
I am using the lmer function (in the lme4 library) to analyse some data where individuals are clustered into sets (using the SetID variable) with a single fixed effect (cc - 0 or 1). The lmer model and output is shown below.
Whilst the fixed effects are consistent with stata (using xtmixed, see below), the std dev of the random effect for SetID is very very small (3.5803e-05)compared to stata's (see below 1.002). Any ideas why this should be happening please....?
LMER MODEL
summary(lmer(AnxietyScore ~ cc + (1|SetID), data=mydf))
Linear mixed model fit by REML
Formula: AnxietyS...