tapply and NA value

I am not really sure what you mean. If I understand you correctly, than all 
ylu have to do is to give additiona parameter to tapply, na.rm=TRUE,

tapply(...., na.rm=TRUE)

However as I already said, I'm not sure what you did and what is the 
problem. Plese provide the code that did not work, possibly with a workable 
example, as the posting guide suggests:
"PLEASE do read the posting guide! 
http://www.R-project.org/posting-guide.html"

I hope this helps in anyway,
Ales Ziberna


----- Original Message ----- 
From: "Leonardo Lami" <lami at faunalia.it>
To: <r-help at stat.math.ethz.ch>
Sent: Friday, March 25, 2005 10:35 AM
Subject: [R] tapply and NA value

Hi,
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
-- 
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
https://www.biglumber.com

______________________________________________
R-help at stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! 
http://www.R-project.org/posting-guide.html