[R-meta] Test statistics for variance components in multivariate meta-analysis and interpretation of the output
Acar, Selcuk
Se|cuk@Ac@r @end|ng |rom unt@edu
Wed Jul 7 18:01:56 CEST 2021
Hi,
I am using metafor package for my three level (study, sample, effect size levels) multivariate meta-analysis. I was trying to figure out how to get confidence intervals and I think I figured out. I could get the output below via "confint". However, there are two things I need to know:
1) How do I obtain test statistics for the variance components? Is there a practical way to do that in metafor package?
2) I know that sigma^2.1, sigma^2.2 and sigma^2.3 are the variance components at three different
levels. But, I do not know what "sigma.1" "sigma.2" and "sigma.3" represent (see the output below).
confint(MVmodel_null, digits=3)
estimate ci.lb ci.ub
sigma^2.1 0.006 0.000 0.020
sigma.1 0.080 0.000 0.143
estimate ci.lb ci.ub
sigma^2.2 0.019 0.008 0.033
sigma.2 0.137 0.091 0.181
estimate ci.lb ci.ub
sigma^2.3 0.011 0.009 0.013
sigma.3 0.106 0.097 0.115
Can you please help with those questions?
Selcuk Acar, Ph.D.
Associate Professor
Department of Educational Psychology
University of North Texas
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