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A system of model fertility schedules with graphically intuitive parameters

  • Carl Schmertmann

    (Florida State University)

I propose and examine a new family of models for age-specific fertility schedules, in which three index ages determine the schedule's shape. The new system is based on constrained quadratic splines. It has easily interpretable parameters, is flexible enough to fit a variety of "noiseless" schedules well, and is inflexible enough to avoid implausible estimates from noisy data. Across a set of over two hundred contemporary ASFR schedules, the new model fits a majority better, and in some cases much better, than the Coale-Trussell model. When fit to a recent Swedish time series, model parameters exhibit simple, regular changes over time, suggesting utility in forecasting applications. In simulated small-sample data the new model produces plausible ASFR estimates, with errors similar to Coale-Trussell.

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File URL: http://www.demographic-research.org/volumes/vol9/5/9-5.pdf
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Article provided by Max Planck Institute for Demographic Research, Rostock, Germany in its journal Demographic Research.

Volume (Year): 9 (2003)
Issue (Month): 5 (October)
Pages: 81-110

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Handle: RePEc:dem:demres:v:9:y:2003:i:5
Contact details of provider: Web page: http://www.demogr.mpg.de/

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  1. Jan Hoem & Dan Madien & Jørgen Nielsen & Else-Marie Ohlsen & Hans Hansen & Bo Rennermalm, 1981. "Experiments in modelling recent Danish fertility curves," Demography, Springer, vol. 18(2), pages 231-244, May.
  2. Ansley Coale & A. John & Toni Richards, 1985. "Calculation of age-specific fertility schedules from tabulations of parity in two censuses," Demography, Springer, vol. 22(4), pages 611-623, November.
  3. Hans-Peter Kohler & Dimiter Philipov, 2001. "Variance effects in the bongaarts-feeney formula," Demography, Springer, vol. 38(1), pages 1-16, February.
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