st: lroc and lfit after bootstrapping a logistic model

[Bema Bonsu <bbonsu@columbus.rr.com>]

Hello listers,

I have been working on a logistic regression model of some data that I 
have. The model fits well as assessed by the Hosmer-Lemeshow 
goodness-of-fit statistic [lfit, group(10) command], and has good 
discrimination (lroc command). Local regression diagnostics are also 
good.

After constructing the model, I ran 1000 bootstrap repetitions using the 
bs command to determine the amount of over-fitting in the model. I then 
retyped the lfit and lroc commands as I had before, and got very 
different numbers from those that I had calculated earlier.

I am curious to know and would be grateful if anyone could tell me if:
1. it is legitimate to run the lroc & lfit commands after a bootstrap 
procedure in Stata, and if so
2. If  typing these commands after running a bootstrap procedure, 
reports these statistics for all the bootstrapped samples, the last 
bootstrapped sample, or some average of those samples.

Thanks a great deal

Sincerely,

Bema Bonsu

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