Hello, I have a data as follow: ID Visit xa1 xa2 yb1 yc23 yb33 I want to look at frequency of visit for ID and create a new column as response . For example my response would be 2 for x and 3 for y. I think I need to write a loop, but I don't know how. I really appreciate your help. Thanks a lot. Best,Farnoosh Sheikhi [[alternative HTML version deleted]]
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