r-help forum
I'm trying to calculate the diff between two rows and them mutate the
difference into a new column. I'm using the diff function but not giving me
what I want.
df <- data.frame(ID=1:5,Score=4*2:6)
What a want where
ID Score diff
1 1 8 8
2 2 12 4
3 3 16 4
4 4 20 4
5 5 24 4
What I am getting
ID Score diff
1 1 8 NA
2 2 12 4
3 3 16 4
4 4 20 4
5 5 24 4
Jeff
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