Hi Willy, The error message may be due to passing an inappropriate environment. I don't have the "erer" package, but if that function has a default for the environment argument, perhaps passing just the "predvars" and "data" arguments will work.
Jim On Tue, Mar 20, 2018 at 8:24 AM, Willy Byamungu <wmuli...@email.uark.edu> wrote: > Dear Oscar, > and any other R-project person, > > Can you please help me to figure out the meaning of the following error > message in red ? > > Error in eval(predvars, data, env) : > numeric 'envir' arg not of length one > > I computed ordered logit models using 'polr' in R (I just followed the > guidance a handout I found on princeton.edu about logit, probit and > multinomial logit models) . The summary results are obtained without any > problem. *However*, when I'm using the package 'erer' to compute the > marginal effects for the ordered logit models, I'm just getting the error > message above. > > Please HELP !!!! > > Willy > > > -- > Willy Mulimbi B. > AEAB Grad Student & Fulbright Scholar > Tel. (+1) 479-316-5981 > Fayetteville, AR > > [[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.
