Convenience function for calculating group-mean covariates.
Creates a between-study (or between-cluster) version of the covariate in question.
group.mean(var, grp)
var |
The covariate cotaining the values to be group averaged. |
grp |
The group from which the average should be calculated. |
A column or vector containing the group.mean covariate.
# Load data data(corrdat) # Create a group mean covariate age_m <- group.mean(corrdat$age, corrdat$studynum)
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