[R] Problem with ordered probit model in MASS

From: justin bem <justin_bem_at_yahoo.fr>
Date: Wed 24 Jan 2007 - 13:47:12 GMT


Dear all,

I got this message, while using the polr function in MASS

>EQ<-as.formula("dep~fpta+tcdv+cdta+cmta+prcd+patc+lactifs+excta")
> Estim<-polr(EQ,don, subset=(cote!=0),method="probit",na.action=na.omit)

Error in polr(EQ, don, subset = (cote != 0), method = "probit", na.action = na.omit) :

        attempt for find suitable starting values failed In addition: Warning messages:
1: algorithm did not converge in: glm.fit(X, y1, wt, family = binomial("probit"), offset = offset) 2: fitted probabilities numerically 0 or 1 occurred in: glm.fit(X, y1, wt, family = binomial("probit"), offset = offset)

how can I initialise starting values ?  

Justin BEM
Elève Ingénieur Statisticien Economiste
BP 294 Yaoundé.
Tél (00237)9597295.                                   



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