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st: fit stat: goodness-of-fit


From   BLEEDBANDW@aol.com
To   statalist@hsphsun2.harvard.edu
Subject   st: fit stat: goodness-of-fit
Date   Fri, 14 Feb 2003 10:52:19 -0500

This is the first time that I have worked with the user generated "fit stat" program.  I wondered if anyone out there could offer me some insight as to why none of the R2 measures are appearing for my "Poisson" syntax below?

Thanks in advance for any help,
Beth 

. poisson falls180 mdscog m210 chairfast m083 m214 m148 mdsfalls180 m277 m278 m
> 297 if los2groups==0, exposure (los91to180) cluster (facil)  nolog irr

Poisson regression                                Number of obs   =        711
Wald chi2(10)   =     142.61
Log likelihood = -1674.5029                       Prob > chi2     =     0.0000

(standard errors adjusted for clustering on facil)

             |               Robust
falls180 |        IRR   Std. Err.      z    P>|z|     [95% Conf. Interval]

mdscog |   1.026908    .023846     1.14   0.253     .9812187    1.074725
m210 |   .1426514   .1045136    -2.66   0.008     .0339346    .5996653
chairfast |    .718835   .1113207    -2.13   0.033     .5306521    .9737523
m083 |   .3330169   .1318824    -2.78   0.005     .1532395    .7237053
m214 |   1.001907   .1976512     0.01   0.992     .6806227    1.474851
m148 |   1.403981   .2481918     1.92   0.055     .9928604    1.985337
mdsfalls180 |    2.19444   .2702449     6.38   0.000     1.723845    2.793502
m277 |   .9953168    .181114    -0.03   0.979     .6967412    1.421842
m278 |   1.673501   .3274209     2.63   0.008     1.140482    2.455635
m297 |   1.033173   .1391611     0.24   0.809     .7934548    1.345314
los91to180 | (exposure)

. fitstat

Measures of Fit for poisson of falls180

Log-Lik Intercept Only:            .     Log-Lik Full Model:        -1674.503
D(700):                     3349.006     LR(10):                            .
Prob > LR:                         .
McFadden's R2:                     .     McFadden's Adj R2:                 .
Maximum Likelihood R2:             .     Cragg & Uhler's R2:                .
AIC:                           4.741     AIC*n:                      3371.006
BIC:                       -1247.665     BIC':                      

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