[R] Struggling to compute marginal effects !

Willy Byamungu wmulimbi at email.uark.edu
Mon Mar 19 22:24:42 CET 2018

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 Mulimbi B.
AEAB Grad Student & Fulbright Scholar
Tel. (+1) 479-316-5981
Fayetteville, AR

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