Hello R users:  

 

I am fairly new to R and am trying to figure out how to compute an intraclass correlation (ICC) and/or design effect for binary data?  More specifically, I am trying to determine the amount of clustering in a data set - that is, whether certain treatment programs tend to work with more or less severe clients.  The outcome variable is dichotomous (low severity / high severity) and the grouping variable is the treatment program.  Any suggestions for some R code or the appropriate R package would be greatly appreciated.  

 

Thanks,

Brian    

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