Re: st: How to calculate mortality ratios

[Steven Joel Hirsch Samuels <sjhsamuels@earthlink.net>]

Gaby, why don't you lay out exactly what your files are, and  what  
analysis variables are in them.  Do you want to do 'proportional'  
mortality ratios, single mortality rates? Do you want to test  
differences among regions (AI02)?
-Steven
On Dec 2, 2007, at 10:13 AM, Ana Gabriela Guerrero Serdan wrote:


> Steve,
>
> thanks. Yes sorry my ratio should have been x/y.
>
> I missed to calculate the total population first as
> this is in a separate file. I was doing calculations
> only among those that died from different causes.
>
> So from file 2 I need to calculate my total
> population. I have individual information for each
> household in the survey. Not sure if I should first
> generate a count variable?
>
> svyset AI06 [pw= expweigh], strata( AI05)
> gen count=_n
> svy: total count, over(AI02)
>
> then use this to calculate the mortality ratio in file
> 1 as you indicated.
>
> thanks again,
> Gaby
>
>
> --- Steven Joel Hirsch Samuels
> <sjhsamuels@earthlink.net> wrote:
>
> > Gaby:
> >
> > 1. Ratio requires a numerator and denominator:
> >
> > svy: ratio myratio = x/y
> >
> > svy: ratio dead      should return an error message
> > in Stata 10.
> >
> > What are your individual observations?  people with
> > dead indicating
> > status yes/no, or some other unit?  If you have an
> > 'area' as your
> > observation, with 'dead' counting deaths and 'pop'
> > giving the
> > population total for the area, then
> >
> > svy: ratio  (mr= dead/pop)
> >
> > would work.
> >
> > 2. svy: prop death   will give proportions dead and
> > not dead.  This
> > will be correct if your analytic unit is person.
> >
> > 3. I suggest that you form new strata by pooling
> > singletons into
> > neighboring regions.
> >
> > -Steven
> > On Dec 2, 2007, at 8:25 AM, Ana Gabriela Guerrero
> > Serdan wrote:
> >
> > > Dear Stata Users,
> > >
> > > I have two related questions:
> > >
> > > 1) Im trying to calcuate mortality ratios for
> > > different sub-populations using survey data.
> > >
> > > Is it very naive from my side to use the following
> > > commands?
> > >
> > > svyset AI06 [pw= expweigh], strata( AI05)
> > > svy: ratio death, over (Province)
> > >
> > > I also get similar results with prop.
> > >
> > > 2)  I dont get any SE because I have strata with
> > one
> > > sampling unit. I see that Stata suggests (as also
> > some
> > > books) to delete or collapse the strata with one
> > > sampling unit. Do you know what are the
> > implications
> > > for this? Would I need to collapse the strata
> > > according to region?
> > >
> > >
> > > thanks,
> > > Gaby
> > >
> > >
> > >
> > > Gaby Guerrero Serdan
> > >
> > > Deparment of Economics
> > > Royal Holloway, University of London
> > > TW20 OEX
> > > Egham, Surrey
> > > England, UK
> http://www.rhul.ac.uk/economics/About-Us/postgrads.html
> > > http://www.flickr.com/photos/49939890@N00/
> > >
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> > Steven  Samuels
> >
> > sjhsamuels@earthlink.net
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>
> Gaby Guerrero Serdan
>
> Deparment of Economics
> Royal Holloway, University of London
> TW20 OEX
> Egham, Surrey
> England, UK
> http://www.rhul.ac.uk/economics/About-Us/postgrads.html
> http://www.flickr.com/photos/49939890@N00/
>
> Tel: +44 7912657259
>
>
>        
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Steven  Samuels

sjhsamuels@earthlink.net
18 Cantine's Island
Saugerties, NY 12477
Phone: 845-246-0774
EFax: 208-498-7441




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