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st: RE: error in rocfit?


From   "David Harrison" <david.harrison@icnarc.org>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: error in rocfit?
Date   Thu, 17 Feb 2005 16:37:16 -0000

Your categorical variable "onefive" appears to take only 2 values - making fitting the binormal model impossible.

David

-----Original Message-----
From: b. water [mailto:barleywater@hotmail.com]
Sent: 17 February 2005 15:36
To: statalist@hsphsun2.harvard.edu
Subject: st: error in rocfit?


dear listers,

i just ran rocfit on a dataset obtaining the following output. surely the
std error or the AUC can't be right (>1). would appreciate advice and
comments. fwiw, roctab showed standard error of 0.0724.

Binormal model of fbs on onefive                  Number of obs   =
39
Goodness-of-fit chi2(-1) =        0.00
Prob > chi2             =           .
Log likelihood          =  -23.115784

------------------------------------------------------------------------------
             |      Coef.   Std. Err.      z    P>|z|     [95% Conf.
Interval]
-------------+----------------------------------------------------------------
   intercept |   1.085096  4.579e+03     0.00   1.000   -8.973e+03
8.975e+03
   slope (*) |   0.912109  5.161e+03    -0.00   1.000   -1.011e+04
1.012e+04
-------------+----------------------------------------------------------------
       _cut1 |   0.887147   0.362530     2.45   0.014     0.176601
1.597692
------------------------------------------------------------------------------
------------------------------------------------------------------------------
             |                    Indices from binormal fit
       Index |   Estimate    Std. Err.                    [95% Conf.
Interval]
-------------+----------------------------------------------------------------
    ROC area |   0.788637 382.665741                    -7.492e+02
750.799708
    delta(m) |   1.189655  1.712e+03                    -3.354e+03
3.356e+03
        d(e) |   1.134972  1.726e+03                    -3.381e+03
3.383e+03
        d(a) |   1.133775  1.871e+03                    -3.665e+03
3.668e+03
------------------------------------------------------------------------------
(*) z test for slope==1

thank you,
bw

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