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  • How to calculate dropouts in dataset by year


    Dear reader,

    Currently, I have a panel dataset with the variables Firm_ID and Year. Across years firms drop out of the sample, but new ones also join. How could I calculate the number of firms that drop from say, 1990 to 1991?

    Initially when I thought I had no "joiners" I had just calculated the number of distinct IDs per year, but that's how I realized I had joiners.


    Kind regards,
    Luis
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