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Re: st: How to calculate mortality ratios


From   Steven Joel Hirsch Samuels <sjhsamuels@earthlink.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: How to calculate mortality ratios
Date   Sun, 2 Dec 2007 09:37:06 -0500

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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18 Cantine's Island
Saugerties, NY 12477
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