probably you're looking for tapply(slp_jeo2$slp, slp_jeo2$jeo, mean, na.rm = TRUE)
Best, Dimitris ---- Dimitris Rizopoulos Ph.D. Student Biostatistical Centre School of Public Health Catholic University of Leuven Address: Kapucijnenvoer 35, Leuven, Belgium Tel: +32/(0)16/336899 Fax: +32/(0)16/337015 Web: http://med.kuleuven.be/biostat/ http://www.student.kuleuven.be/~m0390867/dimitris.htm ----- Original Message ----- From: "temiz" <[EMAIL PROTECTED]> To: <r-help@stat.math.ethz.ch> Sent: Tuesday, April 24, 2007 7:21 PM Subject: [R] problem in tapply command > hello > > when I entered following command, I got NA values for some > catagories. > > > tapply(slp_jeo2$slp,slp_jeo2$jeo,mean ) > 999 Ca Cka DCy Jh JKi > Kk > 14.06665 NA 14.60445 NA NA NA NA > NA > KTa KTac Ku Kua Kus Ky Kyk > ODe > NA NA NA NA NA NA NA > 17.87489 > PTRc Qa Tc Tkisd > NA NA NA 19.64067 > > > how can I correct this problem ? > > regards > > -- > Ahmet Temiz > > > -- > This message has been scanned for viruses and\ dangerous > con...{{dropped}} > > ______________________________________________ > 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 > and provide commented, minimal, self-contained, reproducible code. > Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm ______________________________________________ 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 and provide commented, minimal, self-contained, reproducible code.