hello,
i want to compute the mean of a variable ("aps") for every class
(1,2, and 3).
every id have a few obs., "aps" and class are constant over id.
like this:
id aps class
1 11 2
1 11 2
1 11 2
1 11 2
1 11 2
2 8 3
2 8 3
2 8 3
3 12 2
3 12 2
.
.
i tried:
tapply(icu1$aps_st, icu1$hidclass, function(z) mean(unique(z)))
but it's counting every row and not every id.
thank you,
Sigalit.
[[alternative HTML version deleted]]
______________________________________________
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
