Dear R users
I wonder if there is a quick way to calculate the ratio/fraction of a
list/data frame. For example, if I have a data frame with two fields:
Index and A. I would like to know the fractions of A's within the same
Index. That is, for Index =1, three fractions will be 1/(1+2+3)=0.17,
Is this what you want?
x - read.table(textConnection(Index A
+ 1 1
+ 1 2
+ 1 3
+ 2 4
+ 2 3
+ 3 7
+ 3 9
+ 3 3
+ 3 1), header=TRUE)
data.frame(x, value=ave(x$A, x$Index, FUN=function(z) z / sum(z)))
Index A value
1 1 1 0.167
2 1 2 0.333
3 1 3 0.500
4 2 4
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