how to match two columns of data

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how to match two columns of data

msherman
Dear list: I have a variable which is a list of all students (IDnumbers) that graduated this year. The second variable is a list (of IDnumbers) of all of those students that visited the Counseling Center. My question is how do I match up the two lists so that I can figure out what percentage of students visited the counseling center (besides dividing the n of variable list 2 by the n of variable list 1).   thanks,   martin sherman