Volume 12 - Article 5 | Pages 105-106

Quadratic spline fits by nonlinear least squares

By Carl Schmertmann

Print this page  Send this article to a friend  Twitter

 

 
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 [Email]

Other articles by the same author/authors in Demographic Research

» Stationary populations with below-replacement fertility
Volume 26 - Article 14

» A system of model fertility schedules with graphically intuitive parameters
Volume 9 - Article 5

» Estimating Parametric Fertility Models with Open Birth Interval Data
Volume 1 - Article 5

Most recent similar articles in Demographic Research

» Period Fertility in Russia since 1930: an application of the Coale-Trussell fertility model
Volume 6 - Article 16    | Keywords: fertility, fertility models

» Demographic characteristics of Sardinian centenarian genealogies: Preliminary results of the AKeA2 study
Volume 32 - Article 37    | Keywords: fertility

» What is your couple type? Gender ideology, housework sharing, and babies
Volume 32 - Article 30    | Keywords: fertility

» The force of mortality by life lived is the force of increment by life left in stationary populations
Volume 32 - Article 29    | Keywords: fertility

» Unstable work histories and fertility in France: An adaptation of sequence complexity measures to employment trajectories
Volume 32 - Article 28    | Keywords: fertility

Articles

»Volume 12

 

Citations

 

Similar Articles

 

 

Jump to Article

Volume Page
Volume Article ID