Re: st: Predictive ability of probit model

[Richard Williams <Richard.A.Williams.5@nd.edu>]

At 09:06 PM 3/19/2005 +0000, louis boakye-yiadom wrote:
> 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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