Volume 1 - Article 5

Estimating Parametric Fertility Models with Open Birth Interval Data

By Carl Schmertmann, André Junqueira Caetano

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Date received:06 Aug 1999
Date published:22 Sep 1999
Word count:6000
Keywords:Brazil, Coale-Trussell model, fertility, open birth intervals, statistics
DOI:10.4054/DemRes.1999.1.5
Additional files:Example Data from Municipality of Serra da Saudade (Excel file, 42 kB)
 

Abstract

In the past thirty years, more than 100 censuses gathered fertility data through questions on women's date of last birth. The standard "births last year" (BLY) approach for such data truncates timing information, using binary indicators for births in the prior year only. The first author recently proposed consistent, maximum-likelihood estimation approaches using untruncated date of last birth (DLB).
In this paper we extend DLB techniques to parametric models. We construct estimators for Coale-Trussell M and m parameters from open interval lengths. We apply the new procedure to Brazilian census data, producing maps and spatial statistics for BLY and DLB m estimates in 723 municipalities in Minas Gerais. DLB estimators are less sensitive to sampling error than BLY estimators. This increased precision leads to clearer spatial patterns of fertility control, and to improved regression.
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Author's Affiliation

Carl Schmertmann - Florida State University, United States of America [Email]
André Junqueira Caetano - University of Texas at Austin, United States of America [Email]

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» Quadratic spline fits by nonlinear least squares
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» A system of model fertility schedules with graphically intuitive parameters
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