Volume 12 - Article 5 | Pages 105–106
Quadratic spline fits by nonlinear least squares
| Date received: | 02 Sep 2004 |
| Date published: | 22 Mar 2005 |
| Word count: | 0 |
| Keywords: | fertility, fertility models, quadratic splines, software |
| DOI: | 10.4054/DemRes.2005.12.5 |
| Weblink: | Please click here for the software. |
| Publication 9-5 is also linked to this. | |
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
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