[R] Problem with ordered probit model in MASS

David Duffy David.Duffy at qimr.edu.au
Fri Jan 26 07:38:56 CET 2007

Justin Bem wrote:

> I got this message, while using the polr function in MASS
> Error in polr(EQ, don, subset = (cote != 0), method = "probit", na.action = na.omit) :
>         attempt for find suitable starting values failed
> how can I initialise starting values ?

You might try running an ordered logistic in lrm() and using those estimates
as starting values (if it runs OK).

David Duffy.

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