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Re: st: How to calculate mortality ratios


From   Ana Gabriela Guerrero Serdan <ag_guerreroserdan@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: How to calculate mortality ratios
Date   Sun, 2 Dec 2007 07:13:40 -0800 (PST)

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/
> >
> > Tel: +44 7912657259
> >
> >
> >        
> >
>
______________________________________________________________________
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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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