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st: Re: attributable fraction
Thanks Dr. Cox!!! I appreciate your help in all of
this. I see what you mean about the code. Can I just
delete those three lines?
I am unfamiliar with stata programming. I am
primarily an SPSS user - sacrilege around here - I
know.
Marc
--- Marc Campo <[email protected]> wrote:
> I have calculated several attributable fractions.
> When the AF comes up as negative however, Stata does
> not display a standard error and confidence
> interval.
> Why?
>
> . logistic incident_lowback age gender hours_week
> second_job strain xfer posi manual
>
>
> incident_l~k Odds Ratio Std. Err. z P>z [95% Conf.
> Interval]
>
> age .9849692 .0149313 -1.00 0.318 .9561349 1.014673
> gender .9118571 .3196976 -0.26 0.792 .4586644
> 1.812836
> hours_week 1.000273 .0169735 0.02 0.987 .9675525
> 1.034099
> second_job 1.0135 .3644665 0.04 0.970 .5008663
> 2.050812
> strain 2.311378 .7130899 2.72 0.007 1.262595
> 4.231337
> xfer 1.658223 .4354864 1.93 0.054 .9910564 2.774517
> posi .7943614 .2137511 -0.86 0.392 .4687834 1.346059
> manual 1.025606 .0583063 0.44 0.657 .9174643
> 1.146494
>
>
> . aflogit posi, ref(posi=1)
>
> Term Ref. A.F. s.e. [95% Conf. Int.]*
>
> posi 1 -0.2742 . . .
>
> TOTAL -0.2742 . . .
>
>
> Any thoughts? Why can't you have a negative AF?
>
> Marc
>
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