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st: age when having first child


From   Dirk Nachbar <Dirk.Nachbar@dwp.gsi.gov.uk>
To   statalist <statalist@hsphsun2.harvard.edu>
Subject   st: age when having first child
Date   09 Jun 2006 11:49:50 +0100

All

I have survey data for one year from which I want to estimate an equation for the age a person had his first child. I derive the independent variable from the adult's and oldest child's age. When I regress that equation I have significantly positive cohort effects for old cohorts which I find quite puzzling for my UK sample. My expectation was that the age someone had a child would increase over time. Do you have any views on what might have gone wrong.

Dirk Nachbar

Assistant Economist

Pensim2

Department for Work and Pensions

Level 4, The Adelphi

1-11 John Adam St

WC2N 6HT London

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