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Re: st: repeat: predict after -streg-


From   Steven Samuels <ssamuels@albany.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: repeat: predict after -streg-
Date   Fri, 13 Jul 2007 12:55:02 -0400

One more thought: Some hospitals may have enough readmissions to reliably estimate a fixed-effect hospital intercept. Do so for these hospitals and confine the random-effects model to the others.

-Steve
On Jul 13, 2007, at 12:20 PM, Steven Samuels wrote:



Jeph,

You don't need medians at all, just estimated 30 day readmission rates. I'm not up on this literature, but you might try the following:

1. Fit a survival model with hospital random effects, using - streg-, -stcox-, or -gllamm- with the -frailty- options to define the distributions of the random effects. You can probably improve your predictive model if you add hospital factors as predictors.

2. Rank on the estimated hospital effects. (If you have hospital level factors in your model, add their contribution to the random effect). You can convert the model parameters to estimates of the probabilities of 30 day readmission.

Steven JH Samuels
18 Cantine's Island
Saugerties, NY 12477

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