Hi all, A sample from the dataset attached below. There are some missing month by each ID number(Table1. before). I want to add rows of missing month per each ID(Table2.after). Since I am having more than 30000 IDs, it seems hard to add rows one by one. Is there anyone who have an idea? Thank you in advance. Table1. before. (what I have now) Table2. after (what I want to see) Miyoung
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