Well, you want a mean of length BY sex, so look at by()... See ?by by(your.data.frame,sex,mean)
Petr Jorge Cornejo Donoso napsal(a): > > Hi dear listers > > Do you know how to made a mean by one or more categorical variables? > I can do that quite easy on SAS by in R I just can't do it E.g. > Some fishes > Sex Lenght > male 15 > fema 20 > fema 17 > fema 19 > male 18 > > So the idea is mean(Lenght) by sex, in order to have sex: Male > mean=XX Sex: Fema mean=YY > In this case is quite easy to do it by a loop, but I have a huge DB > so is not an option. Any suggestion? > > Thanks in advance! > > -- > > Jorge Cornejo Donoso > > Universidad Austral de Chile > > Portales 73, Coyhaique,CP 5950000, Region de Aisén, Chile Tel +56 67 244520 > Fax +56 67 239377 > > ______________________________________________ > 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. > > -- Petr Klasterecky Dept. of Probability and Statistics Charles University in Prague Czech Republic ______________________________________________ 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.
