Hi,
I'm getting an error message using polr():
Error in optim(start, fmin, gmin, method = "BFGS", hessian = Hess, ...) :
initial value in 'vmmin' is not finite
The outcome variable is ordinal and factored, and the independant variable
is continuous. I've checked the source code for both polr() and optim()
and can't find any variable called "vmmin" as referenced in the error
message.
Any suggestions welcome.
Thanks,
Anders
> summary(data$ordaodb)
0 1 2 3 4
8228 3505 1755 559 1757
> summary(data$gpconc)
Min. 1st Qu. Median Mean 3rd Qu. Max.
0.138 0.280 0.313 0.305 0.332 0.515
> formula<-data$ordaodb~data$gpconc
> propensityordaodb.plr <- polr(formula, method="cauchit")
> propensityordaodb.plr
Call:
polr(formula = formula, method = "cauchit")
Coefficients:
data$gpconc
8.508
Intercepts:
0|1 1|2 2|3 3|4
2.651 3.569 4.593 5.304
Residual Deviance: 40009.85
AIC: 40019.85
> summary(propensityordaodb.plr)
Re-fitting to get Hessian
Error in optim(start, fmin, gmin, method = "BFGS", hessian = Hess, ...) :
initial value in 'vmmin' is not finite
>
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