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From |
Benoit.Laplante@inrs-UCS.uquebec.ca |

To |
statalist@hsphsun2.harvard.edu |

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

Date |
Thu, 28 Nov 2002 10:28:22 -0500 |

Maybe things are simpler that I think they are but, for what I understand of -merge-, it would merge observations that would have similar values on one or several variables both in File A and File B. The three variables Year, Age and Area do not exist as such in File B: Year defines lines while columns are combinations of Age within Area. Furthermore, there will not be unique combinations of Year, Age and Area in A: some elements of B will have to be copied several times to different lines of A. Also I need to copy only one value from File B on any given line of A, not all 770 values of a given line of B. B. Laplante -----Message d'origine----- De : Stephen P. Jenkins [mailto:stephenj@essex.ac.uk] Envoyé : jeudi 28 novembre 2002 10:12 À : statalist@hsphsun2.harvard.edu Objet : Matching data, Files A &B [Was: Re: st: Picking from a matrix] 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 * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**RE: Matching data, Files A &B [Was: Re: st: Picking from a matrix ]***From:*"Stephen P. Jenkins" <stephenj@essex.ac.uk>

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