> datg=t(sapply(split(datgic, datgic$NPERMNO, drop=TRUE),
function(x){return(> x[nrow(x),] )}))
>
>
> I get something like this...
>
> GVKEY NPERMNO GIC year
> 10001 12994 10001 55102010 2007
> 10002 19049 10002 40101015 2007
> 10009 16739 10009 40101010 1999
>
> Has this been made into a proper data frame. How come the row numbers
are> not 1,2,3,4...?
You can check if a variable is a 'proper data frame' using
is.data.frame(datg) or class(datg).
The row numbers are preserved from the original data frame to make it
easier to check that you've extracted the correct rows. You can renumber
them using
rownames(datg) <- seq_len(nrow(datg))
Regards,
Richie.
Mathematical Sciences Unit
HSL
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