[R] Re: Sum by categorical variable

[Mahmood ARAI]

De Amicis Fabrizio (G.I.T.) writes: 

> Dear R-list,
> I have two variables (numerical and categorical) and  would like to have the
> sum (and maybe some other statistics) of the numerical variable by the
> categorical one. 
> Can you help me,
> Thank you,
> Fabrizio 
> 
> 
> ---------------------------------------------------------------
> Fabrizio De Amicis 
> 
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> 
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> 
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ave is what your are looking for.
See ?ave. 

mahmood arai 

http://www.ne.su.se/~ma