[R] average among one factor in a nested dataframe
Kenneth Roy Cabrera Torres
krcabrer at une.net.co
Mon Apr 25 13:14:19 CEST 2011
I try your code (there is a typo, I believe)
But I don't understand the "nested" databases.
I see that both have f1 variable but I do not see f2 variable in any of
them. So, what do you mean with "collapse f2"?
Maybe you need to first "merge()" de databases and then "aggregate()"
Have a nice day!
El dom, 24-04-2011 a las 23:42 -0500, Junqian Gordon Xu escribió:
> I have two nested data frames:
> I want to preserve id and f1, but want to collapse f2 and take the
> corresponding mean values of a and b. Missing value in either dataframe
> should be handled properly (i.e., just take the non-missing number
> without dividing by 2).
> I had a look at rowSum/Means and s/l/tapply, but couldn't figure out how
> to handle this case cleanly. Any suggestions?
> R-help at r-project.org mailing list
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> and provide commented, minimal, self-contained, reproducible code.
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