Hi Cristina, Try this: names(mydata)
It may be NULL or "ppitrst" may be absent. Jim On Thu, Jul 7, 2016 at 8:26 PM, Cristina Cametti <cristina.came...@gmail.com> wrote: > Dear all, > > I am not able to find a reliable r code to run a multilevel latent class > model. Indeed, I have to analyze how social trust (three variables form the > ESS survey) might vary between countries (21 countries in my database). I > tried to use the poLCA package but I am not sure if my code is right. This is > my code: > lca <- cbind(ppltrst+1,pplfair+1,pplhlp+1)~cntry > lc <- poLCA(lca,mydata) > > However, I get an error message: > Error in `[.data.frame`(data, , match(colnames(y), colnames(data))[j]) : > undefined columns selected > > How can I solve this? Is the code completely wrong or I missed some passages? > Thank you very much for your help! > > Cristina > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
