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My data set looks like this:
symbol date adjusted
BAC 2000-01-03 13.61120
BAC 2000-01-04 12.80331
BAC 2000-01-05 12.94381
BAC 2000-01-06 14.05027
BAC 2000-01-07 13.68145
BAC 2000-01-10 13.20725
Under symbol, there are three different stocks. I want to add a column with the daily returns on the asset, but I am stuck on what to do.