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2005 Sep 29
2
how to fix the level-1 variances in lme()?
Dear all,
Edmond Ng (http://multilevel.ioe.ac.uk/softrev/reviewsplus.pdf) provides
an example to fit the mixed effects meta-analysis in Splus 6.2. The
syntax is:
lme(fixed=d~wks, data=meta, random=~1|study, weights=varFixed(~Vofd),
control=lmeControl(sigma=1))
where d is the effect size, study is the study number, Vofd is the
variance of the effect size and meta is the data frame.
"sigma=1" is required to constrain the level 1 variance in applying
mixed-effects models in meta-analysis.
In Splus 6.1, I found t...