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Jan Karman
Middelburg (Neth)

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Jan Karman
Last update: February 2024

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Migration and migrants (from NIDI - Demos)

International migration is a major factor of demographic and social change and for an increasing number of countries, international migration has become the most important factor of population growth.
As a result European populations are becoming more diverse than ever before. Our research focuses both on migration flows in a macro perspective to better understand European migration patterns, as well as on migrant behavior at the micro level.
Emphasis is put on the demographic and socio-economic position of migrants and the demographic dynamics in migrant families, applying the life course approach to complete the wealth of studies on the structural and cultural position of migrants. See more


Otium cum dignitate

"Reshuffling chaos"

Graduation of Mortality
See also: My article in Vector

Mortality tables are usually graduated for either practical or scientific purposes. The formulae, in which the mortality is expressed as a function of x (= age) are often of the type (Makeham's law):
   mx = A + B.cx (force of mortality)
with A, B and c as parameters. Finding the values of those parameters from the crude material is the hard part.
King-Hardy's method is a suitable way to transform this power function into a linear equation system; it is solved here by way of a least square K-runtime function.
See also E.Zwinggi - Versicherungsmathematik
When invoked, one will find four controls in the bottom part. The first two controls act like a spinbox, the two right most controls simulate the Windows-locator. The challenge is to find as large as possible ranges for making the "law" valid.
Later, famous methods came from Thorvald N. Thiele, published posthumously in 1910, and more recent approaches and remarks can be found at W.J. Willemse.

Recommended for Africa:
G.M.K. Kpedekpo - Essentials of Demographic Analysis for Africa

Jan Karman LinkedIn
Middelburg (Neth), November 2006

 Recent Compositions
Fugues Genevan Psalter
 My harpsichord

LinkedIn:      Profile
Art: Atelier Orsmaal