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2004 May 11
1
Meta-Analysis using lme
...'d like to use a
multi-level model to integrate the findings of a number of primary research
studies.
I set up a simple two level-model (only summary statistics are provided by
each study) as follows:
sapp.lme <- lme(D ~ 1, data = sapp.frame, random = ~ 1 | STUDYNR,
weights=varFixed(~-1+STDERR_D),na.action = na.exclude)
The intercept is random on both levels and the variable stderr_D (the
sampling variance) is supposed to be random only on level one. Besides, I
need to constrain the variance of stderr_d to equal 1.
Could anybody help me correct the code I provided? Thanks in advance for...