TY  - JOUR
A1  - Schmertmann, Carl
T1  - Quadratic spline fits by nonlinear least squares
Y1  - 2005/03/22
JF  - Demographic Research
JO  - Demographic Research
SN  - 1435-9871
SP  - 105
EP  - 106
DO  - 10.4054/DemRes.2005.12.5
VL  - 12
IS  - 5
UR  - https://www.demographic-research.org/volumes/vol12/5/
L1  - https://www.demographic-research.org/volumes/vol12/5/12-5.pdf
L2  - https://www.demographic-research.org/volumes/vol12/5/12-5.pdf
N2  - 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

ER  -