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.
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