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⇤ ← Revision 1 as of 2012-12-06 12:55:42
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| $$\rho$$ = variance_{between subjects} / (variance{between subjects} + variance{within subjects}) | $$\rho = \frac{\mbox{variance_{between subjects}}}{\mbox{(variance{between subjects} + variance{within subjects}}}$$ |
Effect size for multilevel models
$$\rho = \frac{\mbox{variance_{between subjects}}}{\mbox{(variance{between subjects} + variance{within subjects}}}$$
I read in the wikipedia that this "design effect" is used with cluster observations. If we fit a mixed model with a random subject-specific intercept, the clusters are the observations within a participant e. g. the 7 times the participant chose a fruit or a snack. The "design effect" is
D_{eff} = 1 + (m-1) $$\rho$$
where m is the number of observations in each cluster (e.g. number of repeated measures per subject).