Quadratic spline fits by nonlinear least squares
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 mo...
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| Format: | Article |
| Language: | English |
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Max Planck Institute for Demographic Research
2005-03-01
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| Series: | Demographic Research |
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| Online Access: | http://www.demographic-research.org/volumes/vol12/5/ |