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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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**Follow-Ups**:**Re: st: How to calculate mortality ratios***From:*Ana Gabriela Guerrero Serdan <ag_guerreroserdan@yahoo.com>

**References**:**st: How to calculate mortality ratios***From:*Ana Gabriela Guerrero Serdan <ag_guerreroserdan@yahoo.com>

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