Re: st: How to calculate mortality ratios

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

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

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