[R] Struggling to compute marginal effects !
bgunter.4567 at gmail.com
Mon Mar 19 23:18:07 CET 2018
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On Mon, Mar 19, 2018 at 2:24 PM, Willy Byamungu <wmulimbi at email.uark.edu>
> 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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