Hello,

I have a panel data sample consisting of obervations of several years. For each year I have some duplicates which I won`t drop since it is important data. My problem is now, that I don`t know how to "say stata" that I have panel data, since it refuses my time variable. What can I do? Moreover, I don`t know how to do a bivariate correlation with this kind of data. Can anybody help me please?

Kind regards