Hi, Suppose I have a dataframe like: > data y x 1 1 2008 2 1 2008 3 0 2008 4 0 2009 5 1 2009
Now I want to know how much "1" corresponds with 2008 and how much with 2009, the answers are 3 and 1. How can I achieve this? Thanks for the anwer. André [[alternative HTML version deleted]]
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