[R] tapply and NA value

From: Leonardo Lami <lami_at_faunalia.it>
Date: Fri 25 Mar 2005 - 20:35:37 EST

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@faunalia.it            www.faunalia.it
Via Colombo 3 - 51010 Massa e Cozzile (PT), Italy   Tel: (+39)349-1310164
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Received on Fri Mar 25 20:43:39 2005

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