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xs_error
2006 Feb 09
1
effect sizes in lme/ multi-level models
...alltogether,
I am searching for a way to determine "effect size" in multi-level
models by using lme().
Coming from Psychology, for ordinary OLS there are measures (for
meta-analysis, etc.) like
CohensD <- (mean_EG - mean_CG) / SD_pooled
or
(p)eta^2 <- SS_effect / (SS_effect + SS_error)
I do not intend to lead a discussion of the usefulness of such measures
as long as the standards of psychological journals (e.g. as defined by
the APA) order them.
However, I wondered how to determine measures of effect size in lme.
Pinheiro&Bates (2000) do not touch that topic.
I assume t...