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st: Stratified case-crossover analysis referent set creation


From   Kumsa Barsiisaa <kumsaa@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Stratified case-crossover analysis referent set creation
Date   Sat, 26 Jul 2008 10:55:14 +0000

Hi All,
 
I am planning to conduct a time stratified case crossover analysis and struggling to arrange my data set for that purpose.  In this design, an index hospital admission case will have several controls- all in the same weekday, month and year.  As an example, if there is an admission to a hospital today Friday (25/0708), that will be my index case. My controls will be all preceding Fridays of July 2008.  Thus I will have three controls for the index event. If on the other hand a patient is admitted on Wednesday 15/07/08 all other Wednesdays of July (1st, 8th, 22nd and 29th) will be serving as controls.  In the second scenario, two controls are before the index case and two are after.  I would appreciate any ideas and suggestions on how to realize this plan.  I have copied a sample data set below.

Many thanks in advance!
 
date_admis date_control control_seq
01/07/2008 08/07/2008 1
01/07/2008 15/07/2008 2
01/07/2008 22/07/2008 3
01/07/2008 29/07/2008 4
02/07/2008 09/07/2008 1
02/07/2008 16/07/2008 2
02/07/2008 23/07/2008 3
02/07/2008 30/07/2008 4
04/07/2008 11/07/2008 1
04/07/2008 18/07/2008 2
04/07/2008 25/07/2008 3
08/07/2008 01/07/2008 1
08/07/2008 15/07/2008 2
08/07/2008 22/07/2008 3
08/07/2008 29/07/2008 4

Thanks
Kumsaa
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