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Hello, I have a new data set and an old data set. Both have the same columns representing the same sort of measure. Within each data set (old and new) are 18 groups (simplified to three groups below). Within each group are individuals with unique ID numbers. These ID numbers may be the same as other ID numbers in different groups, but a particular ID number only appears once in each group. The

I have two data sets: "new" and "combo". Within both data set, each row pertains to a unique individual. The "combo" data set is a subset of the "new" data set, meaning that all individuals within "combo" are within "new" but not all individuals within "new" are within "combo". Thus, nrow(new) > nrow(combo). Each