st: Identifying unique values within duplicate IDs

[Rebecca M Sacks <rsacks@uoregon.edu>]

Hi all!
I'm dealing with a large dataset that had some errors occur when data 
were being recorded. Although each ID should only have one record, most 
of them have two. Anyway, I'm trying to get a list of IDs where the ID 
variable is a duplicate but the values for a second variable (PHQ9 
score) are different within the duplicate ID. Any advice would be 
greatly appreciated.

Thanks,
Rebecca Sacks
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