st: inteff afer logit

[Sebastian Baumeister <baum_statal@web.de>]

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From	Sebastian Baumeister <sebastian.baumeister@uni-greifswald.de>
To	statalist@hsphsun2.harvard.edu
Subject	inteff afer logit
Date	Fri, 15 Dec 2006 14:31:35 +0100

I am trying to run inteff afer a logit model, which was used to fit a
discrete time survival model, and i get the r(9) error message. Any advise
in what r(9) means and what might have caused r(9) to appear is highly
appreciated.
. logit event _d1 _d2 _d3 _d4 kont_exp sex expxsex, cluster(arzt) nolog
note: _d4 dropped due to collinearity

Logistic regression Number of obs = 2844
Wald chi2(6) = 84.24
Prob > chi2 = 0.0000
Log pseudolikelihood = -1046.9817 Pseudo R2 = 0.0637

(Std. Err. adjusted for 34 clusters in arzt)
------------------------------------------------------------------------------
| Robust
event | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
_d1 | 2.487836 .3662857 6.79 0.000 1.769929 3.205743
_d2 | 2.284119 .36924 6.19 0.000 1.560422 3.007816
_d3 | 1.7861 .3611189 4.95 0.000 1.07832 2.49388
kont_exp | .7616662 .2219238 3.43 0.001 .3267034 1.196629
sex | .5381819 .2434831 2.21 0.027 .0609637 1.0154
expxsex | -.5184373 .2895077 -1.79 0.073 -1.085862 .0489873
_cons | -4.454517 .4642658 -9.59 0.000 -5.364461 -3.544573
------------------------------------------------------------------------------

. inteff event _d1 _d2 _d3 _d4 kont_exp sex expxsex
r(9);


Thanks

Sebastian


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