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st: Re: another aflogit issue


From   Marc Campo <mcam54@yahoo.com>
To   Marc Campo <mcam54@yahoo.com>, statalist@hsphsun2.harvard.edu
Subject   st: Re: another aflogit issue
Date   Tue, 31 Oct 2006 13:55:07 -0800 (PST)

One last aflogit question.  Sometimes, without an
error warning, I get a negative AF with no standard
error or CI.  Is this the case for every negative AF?



c Campo <mcam54@yahoo.com> wrote:

> Name shortening did the trick!!!!!!!!!  Thanks!!!
> Now
> I have to find another excuse to not finish my
> dissertaton!!!!
> 
> Marc
> 
> --- Marc Campo <mcam54@yahoo.com> wrote:
> 
> > Here is what I am doing:
> > 
> > .logistic incident_lowback age gender hours_week
> > second_job job_strain
> > 
> > aflogit job_strain
> > 
> > The regression runs fine but no AF!!
> > 
> > I have also tried this one:
> > 
> > .logistic incident_wrist age gender hours_week
> > second_job xfer position manual_total
> > 
> > .aflogit manual_total, ref(manual_total=3)
> > 
> > I removed the underscores and preserved the data. 
> > No
> > help.  One possible clue....I primarily work in
> > SPSS. 
> > The dataset was transferred using stat transfer.  
> > Those two variables are ones that I had to
> calculate
> > in SPSS as opposed to entering directly in SPSS.  
> > 
> > I could try renaming without underscores in SPSS
> and
> > retransferring............
> > --- Marc Campo <mcam54@yahoo.com> wrote:
> > 
> > > I keep running LR and then typing in aflogit for
> > > particular variables specifying a reference
> level.
> > 
> > > For some variables, no problem.  For others, it
> > says
> > > variable not found or abbreviation is incorrect.
> 
> > I
> > > am
> > > typing in the right names.
> > > 
> > > the variable xfer runs.  the variables
> job_strain
> > > and
> > > manual_total do not.  Anyone know why?
> > > 
> > > thanks,
> > > Marc
> > > 
> > > --- Marc Campo <mcam54@yahoo.com> wrote:
> > > 
> > > > I am looking at a series of ordinal indep
> > > variables
> > > > individually while adjusting for background
> > > factors
> > > > with logistic regression.  I am entering these
> > > > varaibles as continuous as opposed to dummy
> > > coding. 
> > > >  
> > > > 
> > > > I want to use AFLOGIT for attributable
> > fractions. 
> > > I
> > > > am not sure how this works with a continuous
> > indep
> > > > variable however.  My vars are coded from 1-4
> or
> > > > 1-5. 
> > > > 1 in each case is the lowest category.  The AF
> > > > instructions state to make the reference cat
> > your
> > > > non
> > > > exposure category, so I have used 1.  Is the
> > > result
> > > > the AF for all other categories vs. 1 in that
> > > case? 
> > > > 
> > > > That's not what I want.  But with so few
> > > categories,
> > > > I
> > > > can't just take the middle value either. If it
> > > isn't
> > > > just 1 vs. all others, then my results should
> be
> > > > fine.
> > > > 
> > > > Any help is appreciated.
> > > > 
> > > 
> > > 
> > 
> > 
> 
> 

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