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Works like a charm :D Thank you!

Hi Glenn, Thanks for the quick reply! Unfortunately, I don't have a year variable. I only have a month variable that runs from month 1 to month 21. And I have 50 panel members (cross-sections). So my dataset has 21*50=1050 observations I don't need to have a yearly income for each year that I have a...

I'm trying to sum one series by another variable. I have data on incomes for each month for each panelmember (so I have a panel member identifier, a month identifier and a value on income). What I would like to have is a panelmember's yearly income. So I would like to sum the incomes over 12 months ...