**From:** Felix Eschenburg (*Atropin75@t-online.de*)

**Date:** Sun 09 May 2004 - 06:33:15 EST

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Message-id: <200405082233.15813.atropin75@t-online.de>

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] Getting the groupmean for each person"**Previous message:**Henrik Bengtsson: "RE: [R] as.double.default()"**Next in thread:**Gabor Grothendieck: "Re: [R] Getting the groupmean for each person"**Reply:**Gabor Grothendieck: "Re: [R] Getting the groupmean for each person"**Maybe reply:**Liaw, Andy: "RE: [R] Getting the groupmean for each person"

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