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Re: st: Incidence rate ratio


From   Mohammed El Faramawi <melfaram@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Incidence rate ratio
Date   Thu, 6 Mar 2008 09:57:08 -0800 (PST)

Thank you very much guys. Your comments were very
helpful.
Mohammed Faramawi
--- Svend Juul <SJ@SOCI.AU.DK> wrote:

> Mohammed El Faramawi wrote:
>  
> I am trying to calculate the incidence rate
> ratio(IRR)
> for a categorical variable ( Mortality) which  has
> two categories only ( dead or alive) in a
> probability
> weighted sample. I am also trying to adjust for
> covariates. I know that poisson regression can be
> used
> to calculate  (IRR) and adjust for covariates given
> that the outcome is  a count for example the number
> of
> deaths, number stroke attacks, etc . My question is
> what regression should I use  in such a situation
> i.e
> outcome which is not count.Can I still use poisson
> regression which I doubt it?? Thank you
>  
>
---------------------------------------------------------------------
>  
> You can use the -poisson- command with individual or
> aggregated data;
> the examples in the manual and the help file are
> with aggregated data, 
> but the command works fine with individual data,
> coded 1 for dead and
> 0 for alive. To estimate the incidence rate ratio,
> each individual's
> time at risk should also be recorded, here as the
> variable -risktime-.
>  
> Example:
>  
>   . poisson died x1 x2 x3, exposure(risktime) irr
>  
> Hope this helps,
> Svend
>  
>
________________________________________________________
> 
>  
> Svend Juul
> Institut for Folkesundhed, Afdeling for Epidemiologi
> (Institute of Public Health, Department of
> Epidemiology)
> Vennelyst Boulevard 6 
> DK-8000 Aarhus C,  Denmark 
> Phone, work:   +45 8942 6090 
> Phone, home:   +45 8693 7796 
> Fax:           +45 8613 1580 
> E-mail:        sj@soci.au.dk 
>
_________________________________________________________
> 
> 
> 
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