Re: st: difficulty with aflogit command

[Richard Williams <richardwilliams.ndu@gmail.com>]

With user-written postestimation commands, you often need to run the 
estimation command under version control. This is because ereturned 
results can change across versions of Stata, and the post-estimation 
command was written for an older format. Also, it may be that aflogit 
doesn't like variable names that are more than 8 characters, which I 
am guessing was Stata's limit way back when. The following code seems to work:

sysuse auto, clear
version 10: logit foreign mpg rep78
aflogit
clonevar displace = displacement
poisson price weight displace
aflogit


At 12:54 AM 5/29/2011, Ari Samaranayaka wrote:
> 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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-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
HOME:   (574)289-5227
EMAIL:  Richard.A.Williams.5@ND.Edu
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*
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