Can the by() function return a single column?

Vassilis

Wed, Dec 15, 2010 10:10 AM

Hi Gerrit, 

This does exactly what I want, thank you very much! 

Even more, I notice that ave() uses the split/unsplit functions under the
hood, which are very useful tools as they allow to apply even more
complicated functions on a factor-by-factor basis. 

best,

Vassilis

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Thread (4 messages)

Vassilis Can the by() function return a single column? Dec 15 Gerrit Eichner Can the by() function return a single column? Dec 15 Vassilis Can the by() function return a single column? Dec 15 David Winsemius Can the by() function return a single column? Dec 15