Hi,
I've got a dataframe like this:
df =
data.frame(a=rnorm(100,1),b=rnorm(100,10),c=rnorm(100,100),d=rnorm(100,-100))
and I want to calculate sd1 for (a,b,c) for each entry, and sd2 for
(b,c,d) for each entry.
I don't seem to find the answer using aggregate or apply,
How can I do this?
Thanks in advance,
Cheers,
Albert.
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