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st: difficulty with aflogit command
From
Ari Samaranayaka <[email protected]>
To
[email protected]
Subject
st: difficulty with aflogit command
Date
Sun, 29 May 2011 17:54:05 +1200
Hi
I am having difficulty with the user-written command aflogit.
Although it is expected to work after unconditional logit or poisson it
does not work for me.
sysuse auto,clear
logit foreign mpg rep78
aflogit
this produce
Logistic regression Number of obs
= 69
LR chi2(2)
= 33.10
Prob > chi2 =
0.0000
Log likelihood = -25.851693 Pseudo R2 =
0.3903
------------------------------------------------------------------------------
foreign | Coef. Std. Err. z P>|z| [95% Conf.
Interval]
-------------+----------------------------------------------------------------
mpg | .1328672 .0735776 1.81 0.071 -.0113423
.2770767
rep78 | 1.73607 .4928761 3.52 0.000 .7700508
2.70209
_cons | -10.03775 2.407455 -4.17 0.000 -14.75628
-5.319226
------------------------------------------------------------------------------
.
. aflogit
Can only be used after unconditional logistic or poisson regression
last estimates not found
r(301);
Then I used the following.
poisson price weight displacement
aflogit
This produces
Poisson regression Number of obs
= 74
LR chi2(2) =
29652.15
Prob > chi2 =
0.0000
Log likelihood = -29162.101 Pseudo R2 =
0.3370
------------------------------------------------------------------------------
price | Coef. Std. Err. z P>|z| [95% Conf.
Interval]
-------------+----------------------------------------------------------------
weight | .0003235 4.52e-06 71.55 0.000 .0003147
.0003324
displacement | .0000446 .000037 1.20 0.228 -.000028
.0001172
_cons | 7.708671 .0081077 950.79 0.000 7.69278
7.724561
------------------------------------------------------------------------------
. aflogit
Population attributable fraction from poisson regression
Cross-sectional / cohort data (n=74)
Term Ref. A.F. s.e. [95% Conf. Int.]*
----------------------------------------------------------
weight 0 0.6355 11.9561 -3.03e+27 1.0000
ment not found
r(111);
Can someone help me.
I am using stata SE 11.2.
my version of aflogit is
c:\ado\plus\a\aflogit.ado
*! version 1.0.6 16 Sep 1997 STB-42 sbe21
Thank you
Ari
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