Dear All,

I am trying to use the packadge polr () to analyse ordinal categorical data 
responses. Instead of using polr() directly, I have altered the script slightly 
(imposed a constraint to make all the parameters greater than or equal to zero) 
(see below), 


fit <- list(coefficients = exp(beta), zeta = zeta, deviance = 
deviance,........................)

However my main problem is that when I use this "new script" I am unable to get 
the t-values and p-values (though able to get the parameter values and the 
deviance). I have downloaded and scrutinised the polr() script in an attempt to 
understand the section where these t- and p- values are estimated but without 
much success.

Where is polr () are these p- and t-values estimated? 

Thanks

Simo


      
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