Mark All Instances of Duplicates as 1=YES
I have a large set of respondent data where the same respondent may have multiple rows of data (and that is okay), and I want to create a new column that marks a 1=yes if the respondent is a duplicate (for ALL their rows of data, not just the 2nd/3rd/etc. instance), and 0=No if the respondent is not a duplicate (only in 1 row of data). I do NOT want to remove any duplicates. For this example, lets...