Carl Schmertmann

http://www.demographic-research.org/volumes/vol12/5/

doi:10.4054/DemRes.2005.12.5

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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

Author's affiliation
Carl Schmertmann
Florida State University, United States of America

Keywords
fertility, fertility models, quadratic splines, software

Related links

	Please click here for the software.
	Publication 9-5 is also linked to this.

Word count (Main text)
0

Other articles by the same author/authors (in Demographic Research)

	[9-5] A system of model fertility schedules with graphically intuitive parameters
	[1-5] Estimating Parametric Fertility Models with Open Birth Interval Data

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