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Matching data, Files A &B [Was: Re: st: Picking from a matrix]


From   "Stephen P. Jenkins" <stephenj@essex.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Matching data, Files A &B [Was: Re: st: Picking from a matrix]
Date   Thu, 28 Nov 2002 15:12:25 +0000 (GMT Standard Time)

On Thu, 28 Nov 2002 09:37:40 -0500 Benoit.Laplante@inrs-ucs.uquebec.ca 
wrote:

> This is not a follow-up to the SAS vs Stata thread, although it may end up
> that way :-)
> 
> I have two files, say File A and File B.
> 
> File A is set for survival analysis with multiple records per individual.
> Among others, it contains three variables: Year, Age and Area. File B
> contains annual aggregated data that describe some higher level
> characteristic that I want to use as a regressor. Each line of B refers to a
> calendar year, each column of B to age (in year) within one area. The value
> of the regressor, for each record, is the element (Year-1, Age in Area) in
> File B. I want to copy the appropriate value from B to the the appropriate
> line of the regressor column in A.

Don't you just need to -merge- File B onto File A using the relevant 
year, age, area variables as the keys?  And then do the regression.
Or am I missing something?

Stephen
----------------------
Professor Stephen P. Jenkins <stephenj@essex.ac.uk>
Institute for Social and Economic Research (ISER)
University of Essex, Colchester, CO4 3SQ, UK
Tel: +44 (0)1206 873374. Fax: +44 (0)1206 873151.
http://www.iser.essex.ac.uk

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