Agrarimmobilien
2007-Dec-24 21:27 UTC
[R] aggregation with two statistical functions - mean and variance
Hello,
using the syntax
aggregate(daten[,c(3,4)], list(A,B), mean)
I'm getting the following data.frame:
A B C D
1 35 1 6.16000 5
2 47 1 31.24333 20
3 54 1 26.81773 2
4 3 2 12.99000 7
5 4 2 6.49000 1
C and D are both means. But now I want to have: C is mean, D is variance.
How can I do this by using/ changing the aggregation syntax?
Thanks!
Macki
Gabor Grothendieck
2007-Dec-24 21:48 UTC
[R] aggregation with two statistical functions - mean and variance
See summaryBy in the doBy package. On Dec 24, 2007 4:27 PM, Agrarimmobilien <ralf.pfeiffer at agrarimmobilien.info> wrote:> Hello, > > using the syntax > > aggregate(daten[,c(3,4)], list(A,B), mean) > > I'm getting the following data.frame: > > > A B C D > 1 35 1 6.16000 5 > 2 47 1 31.24333 20 > 3 54 1 26.81773 2 > 4 3 2 12.99000 7 > 5 4 2 6.49000 1 > > C and D are both means. But now I want to have: C is mean, D is variance. > > How can I do this by using/ changing the aggregation syntax? > > Thanks! > > Macki > > ______________________________________________ > R-help at r-project.org 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. >