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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 11:47:47 -0500

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/

Tel: +44 7912657259





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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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