> On Jul 7, 2016, at 4:31 AM, Yahoo Mail via R-help <r-help@r-project.org> > 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) >
The documentation for the 'ppltrst' variable in the documentation I see has that name in all caps: http://www.europeansocialsurvey.org/docs/round6/survey/ESS6_appendix_a7_e02_1.pdf > However, I get an error message: > Error in `[.data.frame`(data, , match(colnames(y), colnames(data))[j]) : > undefined columns selected Check your spelling of all variables: lchar <- character(); for( i in 2:4){ lchar=c(lchar, as.character(lca[[2]][[i]][[2]]))} lchar #[1] "ppltrst" "pplfair" "pplhlp" all( c( lchar, 'cntry') %in% colnames(mydata) ) > > How can I solve this? Is the code completely wrong or I missed some passages? > Thank you very much for your help! -- David Winsemius Alameda, CA, USA ______________________________________________ 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.
