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

[Charles C. Berry]

On Tue, 2 Feb 2010, sjaffe wrote:

>
> '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.
>


try

 	sapply( split( data.frame(x,w), grp) , do.call, what=weighted.mean )


HTH,

Chuck

>
> 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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Charles C. Berry                            (858) 534-2098
                                             Dept of Family/Preventive Medicine
E mailto:cberry at tajo.ucsd.edu	            UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/  La Jolla, San Diego 92093-0901