[R] tapply and NA value

Leonardo Lami lami at faunalia.it
Fri Mar 25 10:35:37 CET 2005

I'm writing for a little help.
I have a dataframe with same NA value and I'd like to obtain the means of the 
value of a coloumn grouped by the levels of a factor coloumn of the datframe.
I'm using the function "tapply" but I see that if only a NA value is present 
the result is NA.
There is an option to have the correct result or I must use an other function?

Thanks of all
Leonardo Lami
lami at faunalia.it            www.faunalia.it
Via Colombo 3 - 51010 Massa e Cozzile (PT), Italy   Tel: (+39)349-1310164
GPG key @: hkp://wwwkeys.pgp.net http://www.pgp.net/wwwkeys.html

More information about the R-help mailing list