Displaying 1 result from an estimated 1 matches for "tp3315163p3315279".
2011 Feb 20
1
Conditional sum
Hi,
I have a DF like this:
DF = data.frame(read.table(textConnection(" A B C
1 b1 1999 0.25
2 c1 1999 0.25
3 d1 1999 0.25
4 a2 1999 0.25
5 c2 1999 0.25
6 d2 1999 0.25
7 a3 1999 0.25
8 b3 1999 0.25
9 d3 1999 0.25
10 a4 1999 0.25
11 b4 1999 0.25
12 c4 1999 0.25
13 b1 2001 0.5
14 a2 2001 0.5
15 b1 2004 0.33
16 c1 2004 0.33
17 a2 2004 0.33
18 c2 2004