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2005 May 15
1
Not sure if this is "aggregate" or some other task.
...Not I'd like to do an analysis where I have two scores... the first being
the mean of the first two taken the same day, and the second being the one
taken later.
I have a lot of other variables in the row, and I'd like to do the same
thing to all of them. Soo....
Data.Frame:
Subj Obs MeasureA MeasureB
1 1 45 685
1 2 50 690
1 3 48 693
2 1 39 595
2 2 41 585
2 3 45 343
should become:
Subj Obs MeasureA MeasureB
1 1 47.5 687.5
1 2 50 690
2 1 40 590
2 2 41 585
It seems like a job for "aggregate", but I want to collapse on only cases
where observation # < 3, and take the mean...