Re: st: Predictive ability of probit model

["louis boakye-yiadom" <louisby@hotmail.com>]

Thanks, Richard. What I'm looking for is the percentage of cases correctly 
predicted, as well as, the percentage incorrectly predicted. By the way, I 
just tried the lstat, but I got the following error message:

. lstat;
last estimates not found
r(301);

The lstat command just followed the "dprobit" command in my do file. Thank 
you.

Louis



> From: Richard Williams <Richard.A.Williams.5@nd.edu>
> > Dear All,
> > After estimating a probit model, how can I let stata provide me with the 
> > predictive ability of the model? I suspect this is easy to do, but I'm 
> > fairly new to stata and I couldn't find the answer from the online help 
> > feature. Many thanks.
> >
> > Louis
> Louis, could you clarify what you mean by "predictive ability" of a model?  
> There is the -lstat- command, which will show you the percentage of cases 
> correctly classified.  The -predict- command can compute predicted 
> probabilities for each case, as well as residual statistics that indicate 
> problems in prediction.  The default output includes various measures of 
> model fit, including the model chi-square and McFadden's Pseudo R^2; still 
> more can be obtained with the -fitstat- command that is part of -spostado-. 
>  The -adjust- command is great for plugging in hypothetical/representative 
> values and seeing what the predicted probabilities are under the estimated 
> model (e.g. low income males, high income females.) If you can be more 
> specific about what you want, we might be able to point you in a specific 
> direction.

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