Dear Emily,
a possible reference for the topics you're interested in is Fleiss JL, Levin
B, Paik CM. Statistical methods for Rates and Proportions. 3rd edition.
Chichester: Wiley, 2003.
Sorry I cannot be more helpful.
Kind Regards,
Carlo
-----Messaggio originale-----
Da: [email protected]
[mailto:[email protected]] Per conto di Emily
Putnam-Hornstein
Inviato: giovedì 18 giugno 2009 7.06
A: [email protected]
Oggetto: st: Can I Use Rate Ratios to Compare Two "Disease" Outcomes?
I wish to make comparisons between injury death rates and rates of child
maltreatment. I have computed age-specific injury death rates per 100,000,
Rate Ratios (RR) and 95% confidence intervals using the Stata command "ir".
Similarly, I have computed maltreatment rates per 1,000, RR, and confidence
intervals for these same age and race groups (and during the same period).
For example (white is the reference group):
ir deaths black pop, by(agecat)
ir subs black pop, by(agecat)
Now, I would like to compute a ratio of the maltreatment rate to the rate of
death for a given age/race group (I am exploring the all-cause injury death
rate as a proxy for child welfare service needs). In other words, I would
like to examine the association between maltreatment rates and death rates,
within race. To accomplish this, I have used the "iri" command, entering the
population count twice (since the same age/race population was exposed to
both maltreatment and death in a given year).
For example, having computed black to white RR for deaths and maltreatment
above, I now compute a RR of maltreatments to deaths for each race/age group
combination:
black infants:
iri subs deaths pop pop
Are there any obvious problems with this method from a statistical
standpoint? Can I consider the confidence intervals to be valid? Any other
suggestions for how I might compare these two rates? I've explored some
epidemiology text books, but haven't identified anything relevant. Any
thoughts/suggestions would be very welcome.
Thank you.
Emily
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