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Autor:
Carl Schmertmann
Publikováno v:
Demographic Research, Vol 44, p 45 (2021)
Background: High-dimensional parametric models with penalized likelihood functions strike a good balance between bias and variance for estimating continuous age schedules from large samples. The penalized spline (P-spline) approach is particularly us
Externí odkaz:
https://doaj.org/article/852e3236c68645fbb1bbb4a8362189b8
Autor:
Carl Schmertmann
Publikováno v:
Demographic Research, Vol 42, p 17 (2020)
Background: Some formal demographic models describe mortality improvement in terms of averted deaths. In such models individuals who would have died in an earlier regime are instead revived and returned to the population to face the same age-specifi
Externí odkaz:
https://doaj.org/article/91dd4da774264b8b931ea48be2d33adc
Publikováno v:
Demographic Research, Vol 41, p 41 (2019)
Contribution: As Demographic Research reaches 20 years of activity, encapsulated in 40 volumes freely accessible online, four of the editors who have led the journal during the period 1999-2019 reflect on its past, present, and future. The journal is
Externí odkaz:
https://doaj.org/article/545fd9be91f24128b64fc10d15d45687
Autor:
Carl Schmertmann
Publikováno v:
Demographic Research, Vol 26, p 14 (2012)
BACKGROUND A population with sustained below-replacement fertility and constant immigration eventually becomes stationary. Stationary-through-immigration (SI) populations have unusual age structures that depend on the distribution of immigrants' arri
Externí odkaz:
https://doaj.org/article/34fd6509a67a498a9590d9fd75c45f46
Autor:
Carl Schmertmann
Publikováno v:
Demographic Research, Vol 12, p 5 (2005)
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 empir
Externí odkaz:
https://doaj.org/article/9255ddf284d2421d8a67d271360d2660
Autor:
Carl Schmertmann
Publikováno v:
Scopus-Elsevier
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
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::f65b74ea3f04ea6c3116d3722491f350
http://www.demographic-research.org/volumes/vol9/5/9-5.pdf
http://www.demographic-research.org/volumes/vol9/5/9-5.pdf
Publikováno v:
Demographic Research. 1(5)
In the past thirty years, more than 100 censuses gathered fertility data through questions on women's date of last birth. The standard "births last year" (BLY) approach for such data truncates timing information, using binary indicators for births in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od_______645::afbabbcd13c15740a01777e87f4c9481
http://www.demographic-research.org/volumes/vol1/5/1-5.pdf
http://www.demographic-research.org/volumes/vol1/5/1-5.pdf