Hello,
In your first call, perf(GROUP11), you're passing a data.frame, in the
'tapply' and 'aggregate'
you are passing a vector, x1$SALES, and the operator '$' is not valid.
> tapply(x1$SALES, list(x1$YEAR, x1$GROUP), perf)
Error in x$SALES : $ operator is invalid for atomic vectors
There's anot
Hi,
I wrote a function which works for one group but not for multiple groups in
several years. Could anyone help me out?
The dateset has 3 variables, year, group, and sales. I want to calculate the
annual group median adjusted sales performance for observation i in group j and
year yr, I do th
2 matches
Mail list logo
