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Re: st: comparing differences of rate differences


From   Ricardo Ovaldia <ovaldia@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: comparing differences of rate differences
Date   Wed, 10 Mar 2004 05:05:06 -0800 (PST)

Thank you Philip.

Best,
Ricardo.

--- Philip Ryan <philip.ryan@adelaide.edu.au> wrote:
> Depending on whether your "rates" are true incidence
> densities or 
> cumulative rates (treated as proportions as your
> current analyses imply) 
> you could use either the -ir- or -cs- commands of
> the epitab suite  (see 
> -help epitab-). The  binary exposure variable is the
> year   and 
> the   -by()-  option would have race as a 0/1
> variable as its 
> argument.  The test for heterogeneity is a rather
> non-powerful test of 
> whether the effect of year on admission differs
> between the races.
> 
> Alternatively, model it (using -poisson- or -binreg-
> depending on your 
> conception of the rate and the metric you wish to
> use) with a 
> year*race  interaction term.
> 
> eg for risk differences:
> 
> binreg  admitted  year  race  year_X_race, rd
> 
> The coefficient on the interaction term is of
> interest.
> 
> Phil
> 
> 
> 
> 
> At 04:15 PM 9/03/2004 -0800, you wrote:
> >Dear all,
> >
> >This is not really a Stata question but I have been
> >unsuccessful finding a satisfactory answer. Any
> >assistance will be greatly appreciated.
> >
> >I have computed hospital admission rates for two
> >different years (1996, 2002). To compare these
> rates I
> >can simply use Stata’s ­prtest- (or ­tabulate- ) to
> >test whether these rates differ.
> >
> >Now, if I compute these rates separately for Whites
> >and Blacks, how can I test if the change in rates
> from
> >1996 to 2002 is different for whites than for
> blacks?
> >
> >Thank you,
> >Ricardo.
> >
> >
> >=====
> >Ricardo Ovaldia, MS
> >Statistician
> >Oklahoma City, OK
> >
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> 
> Philip Ryan
> Associate Professor,
> Department of Public Health
> Associate Dean (Information Technology)
> Faculty of Health Sciences
> University of Adelaide 5005
> South Australia
> tel 61 8 8303 3570
> fax 61 8 8223 4075
> http://www.public-health.adelaide.edu.au/
> CRICOS Provider Number 00123M
>
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=====
Ricardo Ovaldia, MS
Statistician 
Oklahoma City, OK

__________________________________
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