**From:** Gabor Grothendieck (*ggrothendieck@myway.com*)

**Date:** Sun 09 May 2004 - 07:02:40 EST

**Next message:**Gabor Grothendieck: "Re: [R] Indexing column of a matrix with infix $"**Previous message:**Felix Eschenburg: "[R] Getting the groupmean for each person"**In reply to:**Felix Eschenburg: "[R] Getting the groupmean for each person"**Next in thread:**Thomas Lumley: "Re: [R] Getting the groupmean for each person"**Reply:**Thomas Lumley: "Re: [R] Getting the groupmean for each person"

Message-id: <loom.20040508T225858-512@post.gmane.org>

predict(lm(AV~as.factor(GROUP)))

Felix Eschenburg <Atropin75 <at> t-online.de> writes:

:

: Hello list !

:

: I have a huge data.frame with several variables observed on about 3000

: persons. For every person (row) there is variable called GROUP which indices

: the group the person belongs to. There is also another variable AV for each

: person. Now i want to create a new variable which holds the group mean of AV

: as a value for each person.

: With tapply(AV,GROUP,mean) i get the means for each level of GROUP, but i

: cannot find out, how to give every person the groupmean as a value (every

: person should have the same value as every other person in the same group).

:

: Has anybody any ideas how to do that ?

:

: Yours sincerly

: Felix Eschenburg

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**Next message:**Gabor Grothendieck: "Re: [R] Indexing column of a matrix with infix $"**Previous message:**Felix Eschenburg: "[R] Getting the groupmean for each person"**In reply to:**Felix Eschenburg: "[R] Getting the groupmean for each person"**Next in thread:**Thomas Lumley: "Re: [R] Getting the groupmean for each person"**Reply:**Thomas Lumley: "Re: [R] Getting the groupmean for each person"

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