Hi, I'm trying to make a model in order to know wich factors got´s influence in the intensity of a infection, but just in the individuals who's got this infection. In my data I've got a variable called "prevalence" with 2 levels: 1.- Infected individual 0.- Non infected
So what i'm trying to do is a subset in a model like this, model<-aov(intensity~ageandsex*month*zone*year,subset=(prevalence=="1")) Is a correct way? I prefer to make the subsets with [], but doesn't work, why > model<-aov(hemogregarinas~edadysexo*mes*zona*ano,[prevalencia=="1"]) Error: inesperado '[' en "model<-aov(hemogregarinas~edadysexo*mes*zona*ano,[" And finally, look at this, i don't know why I get different results > summary(hemogregarinas[prevalencia=="1"]) Min. 1st Qu. Median Mean 3rd Qu. Max. 1.00 5.00 9.00 15.94 19.00 173.00 > summary(hemogregarinas,subset=(prevalencia=="1")) Min. 1st Qu. Median Mean 3rd Qu. Max. 0.00 4.00 9.00 14.92 18.00 173.00 Thanks very much ----- Mario Garrido Escudero PhD student Dpto. de Biología Animal, Ecología, Parasitología, Edafología y Qca. Agrícola Universidad de Salamanca -- View this message in context: http://r.789695.n4.nabble.com/Problems-making-subsets-with-or-subset-tp3245007p3245007.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org 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.
