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Yes, understood. I see your point. This is my first time with panel/cross-section so not yet coming naturally to me. I will revisit tomorrow and see how I get on. With many thanks.

I've attached sanitised version of the file, but still get same error.

Hi, I'm good with time series, but this is my first venture into cross-section and panel data. I have series of logins and then transactions for a 6 month period. Naturally, the number of transactions on each login varies between logins. Login is text and numbers (Lnnnnnn). Transaction is a number a...