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
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