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st: cflpois - wrapper for "stratified" confidence intervals for incidence rates of cii procedure


From   "Jens M. Lauritsen" <JM.Lauritsen@dadlnet.dk>
To   statalist@hsphsun2.harvard.edu
Subject   st: cflpois - wrapper for "stratified" confidence intervals for incidence rates of cii procedure
Date   Sun, 06 Oct 2002 17:33:04 +0200

The previous cflpois had an error when the "by" variable was without a label. 
The procedure has been updated to v1.02 works in Stata 6 & 7. 
Example of call and output is (artificial data): 

. cflpois count riskdays, by(period) dec(2) mult(100) n(persons)

  period        N     count     riskdays    rate       l  a       h
         3     1325       349        56599    0.62    0.55  -    0.68
         5     1400       374        68160    0.55    0.49  -    0.61
         8     1435       381        78721    0.48    0.44  -    0.54
       10     1569       414        89329    0.46    0.42  -    0.51
         .... etc for all values of "per" 
        46     2896       459       299579    0.15    0.14  -    0.17

         t           N     count     riskdays    rate       l  a       h
     Total       43008      8711      3631727    0.24    0.23  -    0.24

The help file has been modified and a new option added "dec(  )" which
allows the user to determine number of decimals. 

All cflpois does is actually to collapse data based on the variable (-les)
indicated in the by option and then passes the actual counts and time at
risk to cii procedure. Therefore the reference for calculations is now
Stata procedure cii. 

Before it was:  Haenszel W, Loveland D, Sirken MG. Lung cancer mortality as
related to residence  and smoking histories. J Natl Cancer Inst 1962; 28:
947-1001 
 reprinted in: Breslow NE, Day NE: Statistical Methods in cancer Research.
Lyon,
 IARC, 1987. P. 70.

The updated version is available in SSC within a few days. And from today
on my own site. It will be removed from my own site when it is in SSC


Jens M. Lauritsen, Consultant,MD. PhD.
Accident Analysis Group, Odense University Hospital, 
Odense, Denmark e-mail: JM.Lauritsen@dadlnet.dk
Initiator of EpiData, see www.epidata.dk for DataEntry in windows (EpiInfo
V6 principle)
For news on Epidata, sign on at: www.epidata.dk/php/maillist.php
Phone +45 6541 2293 Mobile +45 2173 2293 fax: +45 6613 6581 
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