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Estimating Parametric Fertility Models with Open Birth Interval Data

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  • Carl Schmertmann

    (Florida State University)

  • André Junqueira Caetano

    (University of Texas at Austin)

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. (NOTE from the editorial office: to best view the HTML of this article, you should be using Windows 95 or higher. Readers using other operating systems may not be able to view all of the embedded symbols, and we suggest they use the PDF version instead.)

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Bibliographic Info

Article provided by Max Planck Institute for Demographic Research, Rostock, Germany in its journal Demographic Research.

Volume (Year): 1 (1999)
Issue (Month): 5 (September)
Pages:

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Handle: RePEc:dem:demres:v:1:y:1999:i:5

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Web page: http://www.demogr.mpg.de/

Related research

Keywords: Brazil; Coale-Trussell model; fertility; open birth intervals; statistics;

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  1. Carl Schmertmann, 1999. "Fertility estimation from open birth-interval data," Demography, Springer, vol. 36(4), pages 505-519, November.
  2. K. Srinivasan, 1968. "A set of analytical models for the study of open birth intervals," Demography, Springer, vol. 5(1), pages 34-44, March.
  3. K. Srinivasan, 1970. "Findings and implications of a correlation analysis of the closed and the open birth intervals," Demography, Springer, vol. 7(4), pages 401-410, November.
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