Hi, I have a dataset with about 7000 observations. Some are identified as twins, signaled by a 0/1 variable "TWIN", and a family variable ID "FAMILY" indicates whether they are part of the same family (e.g. twins would have the same Family ID). I would like to run a Kappa Statistic showing the concordance between their reports on a childhood variable "CHILD", but am unsure how to get the data set in the appropriate mode for that without manually looking and recognizing everyone with the same family variable as twins. Once I reorganize the data, I can run a Kappa Statistic without any issues. Any help would be appreciated.
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