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st: RE: Confidence intervals for incidence rate


From   "Sandy Carter" <sandy_33@bellsouth.net>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Confidence intervals for incidence rate
Date   Sun, 23 Feb 2003 10:36:59 -0500

Paul,

The Stata command you cite provides exact confidence limits for an
incidence density.  You could use approximations for the Poisson to get
confidence intervals, but why?  I consider the exact limits the "deluxe"
method.

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Paul O'Brien
Sent: Saturday, February 22, 2003 4:54 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: Confidence intervals for incidence rate


I want to calculate the CI for a single incidence density:

5 pregnancies in 5240 months of exposure.

The delta method has been recommended. Can I use it in Stata?

There is the poisson:
 .cii #exposure #events, poisson [ level(#) ]

Epitab give CIs for the incidence rate ratio in - irr -, but not for the
individual incidence rates.

Thanks

Paul

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