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Quadratic spline fits by nonlinear least squares

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Author Info

  • Carl Schmertmann

    (Florida State University)

Abstract

This web program fits a Quadratic Spline model, as described in Schmertmann (2003; Demographic Research Volume 9, Article 5), to any empirical fertility schedule supplied by the user. The fit minimizes the sum of squared differences between the empirical nfx values and the nfx values from the QS model schedule. Output includes parameter estimates, a graphical depiction of the fitted schedule, and several text reports. Users do not need specialized statistical software or a particular operating system to run the program; the only requirement is a web browser. Software http://www.demographic-research.org/Volumes/Vol12/5/qsfit/qsfit.html

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File URL: http://www.demographic-research.org/volumes/vol12/5/12-5.pdf
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Bibliographic Info

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

Volume (Year): 12 (2005)
Issue (Month): 5 (March)
Pages: 105-106

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Handle: RePEc:dem:demres:v:12:y:2005:i:5

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

Related research

Keywords: fertility; fertility models; quadratic splines; software;

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Cited by:
  1. Ezra Gayawan & Samson Adebayo & Reuben A. Ipinyomi & Benjamin Oyejola, 2010. "Modeling fertility curves in Africa," Demographic Research, Max Planck Institute for Demographic Research, Rostock, Germany, vol. 22(10), pages 211-236, February.

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