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Quadratic spline fits by nonlinear least squares

Author

Listed:
  • 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.Softwarehttp://www.demographic-research.org/Volumes/Vol12/5/qsfit/qsfit.html

Suggested Citation

  • Carl Schmertmann, 2005. "Quadratic spline fits by nonlinear least squares," Demographic Research, Max Planck Institute for Demographic Research, Rostock, Germany, vol. 12(5), pages 105-106.
    • Handle: RePEc:dem:demres:v:12:y:2005:i:5
    DOI: 10.4054/DemRes.2005.12.5
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    Cited by:

    1. Alina Ștefania CHENIC (CREȚU) & Alin Ioan CREȚU & Laurențiu TEȘCAN, 2018. "A Long Term Analysis of Two Undeniable Realities of the XXI Century - Global Economic Crisis and Demographic Aging," REVISTA DE MANAGEMENT COMPARAT INTERNATIONAL/REVIEW OF INTERNATIONAL COMPARATIVE MANAGEMENT, Faculty of Management, Academy of Economic Studies, Bucharest, Romania, vol. 19(2), pages 196-212, May.
    2. Ezra Gayawan & Samson B. 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.

    More about this item

    Keywords

    fertility; fertility models; software; quadratic splines;
    All these keywords.

    JEL classification:

    • J1 - Labor and Demographic Economics - - Demographic Economics
    • Z0 - Other Special Topics - - General

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