[R] help with summary(polr_model)

From: Luca Braglia <lbraglia_at_gmail.com>
Date: Thu, 13 Mar 2008 23:52:43 +0100


hello everybody

I'm a newbie with ordered probit and with polr too. The problem is that I have a dependent variable I need to explain with an ordered probit that is

> head(dfscale$sod.sit.ec.fam,100)
> [1] 5 7 5 6 5 5 6 8 6 8 8 8 6 6 6 5 0 5 NA 6
> [21] 7 NA NA 0 0 2 5 3 6 6 7 6 NA 8 6 6 7 NA NA NA
> [41] 4 5 NA 10 3 9 10 10 7 5 5 5 NA NA 5 7 1 1 7 3
> [61] 6 7 NA 4 6 NA 3 4 5 3 4 4 4 5 NA 2 4 4 8 5
> [81] 5 4 6 6 5 6 7 7 7 7 7 6 8 7 6 5 5 5 6 7

so when I estimate the model

> base.op <- polr(
> as.ordered(sod.sit.ec.fam) ~
> log(y) +
> log(ncomp) +

                

> eta +
> I(eta^2) +
> uomo +

> elem +
> laurea +
> saluteno +
> extra
> ,

> weights = dfscale$w,
> data = dfscale,
> method = "probit"

> )

I get

> Warning in eval(expr, envir, enclos) :
> non-integer #successes in a binomial glm

Then when I try to summarize the model, in order to use xtable

> summary(base.op)

> Re-fitting to get Hessian

> Errore in optim(start, fmin, gmin, method = "BFGS", hessian =
> Hess, ...) :
> valore iniziale in 'vmmin' non finito

that freely translated to english means "starting value in 'vmmin' not finished (or finite, more likely)"

what does this mean? How can I have my summary?

Thank you

  Luca

-- 
             Luca Braglia, aka Bragliozzo
           http://bragliozzo.altervista.org

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