[R] tapply for function taking of >1 argument?

Bert Gunter gunter.berton at gene.com
Tue Feb 2 22:24:14 CET 2010


Bert Gunter
Genentech Nonclinical Statistics

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
Behalf Of sjaffe
Sent: Tuesday, February 02, 2010 1:16 PM
To: r-help at r-project.org
Subject: Re: [R] tapply for function taking of >1 argument?

'fraid not :-((

tapply( data, groups, weighted.mean, weights) 

won't work because the *entire* weights vector is passed as the 2nd arg to
weighted.means. But weighted.mean needs 'weights' to be split in the same
way as 'data' -- the first and 2nd args need to correspond. 

Jorge Ivan Velez wrote:
> Hi sjaffem,
> You were almost there:
> tapply( yourdata, groups, weighted.mean, weights)
> See ?tapply for more information.
> HTH,
> Jorge

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