Thanks very much! Best of all, Leonardo
Alle 10:52, venerd́ 25 marzo 2005, Dimitris Rizopoulos ha scritto: > you should look at the 'na.rm=FALSE' argument of '?mean()', i.e., > > x <- rnorm(100); x[sample(100, 10)] <- NA > f <- sample(letters[1:5], 100, TRUE) > ############### > tapply(x, f, mean) > tapply(x, f, mean, na.rm=TRUE) > > > I hope it helps. > > Best, > Dimitris > > ---- > Dimitris Rizopoulos > Ph.D. Student > Biostatistical Centre > School of Public Health > Catholic University of Leuven > > Address: Kapucijnenvoer 35, Leuven, Belgium > Tel: +32/16/336899 > Fax: +32/16/337015 > Web: http://www.med.kuleuven.ac.be/biostat/ > http://www.student.kuleuven.ac.be/~m0390867/dimitris.htm > > > ----- Original Message ----- > From: "Leonardo Lami" <[EMAIL PROTECTED]> > To: <r-help@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 > > [EMAIL PROTECTED] 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@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 -- Leonardo Lami [EMAIL PROTECTED] 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@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
