Displaying 1 result from an estimated 1 matches for "tp3315163p3315163".
2011 Feb 20
1
Conditional sum
....40 0
24 c1 1981 0.40 0
If I do this - DF$D<-ave(DF$C,DF$A,FUN = function(x) sum(x)) - it returns
for each factor the sum of C for all years. How do I build the (B) condition
in this function? Thanks very much!
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