Jaroslav Hájek (; 1926–1974) was a
Czech
Czech may refer to:
* Anything from or related to the Czech Republic, a country in Europe
** Czech language
** Czechs, the people of the area
** Czech culture
** Czech cuisine
* One of three mythical brothers, Lech, Czech, and Rus'
Places
*Czech, ...
mathematician
A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems.
Mathematicians are concerned with numbers, data, quantity, structure, space, models, and change.
History
On ...
who worked in
theoretical
A theory is a rational type of abstract thinking about a phenomenon, or the results of such thinking. The process of contemplative and rational thinking is often associated with such processes as observational study or research. Theories may be s ...
and
nonparametric
Nonparametric statistics is the branch of statistics that is not based solely on parametrized families of probability distributions (common examples of parameters are the mean and variance). Nonparametric statistics is based on either being dist ...
statistics.
The
Hajek projection In statistics, Hájek projection of a random variable T on a set of independent random vectors X_1,\dots,X_n is a particular measurable function of X_1,\dots,X_n that, loosely speaking, captures the variation of T in an optimal way. It is named aft ...
and the
Hájek–Le Cam convolution theorem In statistics, the Hájek–Le Cam convolution theorem states that any regular estimator in a parametric model is asymptotically equivalent to a sum of two independent random variables, one of which is normal with asymptotic variance equal to the ...
are named for him (as well as collaborator
Lucien Le Cam
Lucien Marie Le Cam (November 18, 1924 – April 25, 2000) was a mathematician and statistician.
Biography
Le Cam was born November 18, 1924 in Croze, France. His parents were farmers, and unable to afford higher education for him; his father die ...
).
Life
Jaroslav Hájek studied statistical and insurance engineering at the Faculty of Special Sciences of the
Czech Technical University
Czech Technical University in Prague (CTU, cs, České vysoké učení technické v Praze, ČVUT) is one of the largest universities in the Czech Republic with 8 faculties, and is one of the oldest institutes of technology in Central Europe. It ...
in Prague and in 1950 he successfully completed this study by obtaining an engineering degree. In 1955 he received the title of CSc. for the paper Contributions to the theory of statistical estimation, the supervisor of this thesis was Josef Novák. In 1963, he received a D.Sc. in the same year he received his habilitation at the Faculty of Mathematics and Physics of Charles University, in 1966 he was entitled professor at this faculty. In 1973, he was awarded the Klement Gottwald State Prize for his work on the asymptotic theory of ordinal tests. He died at the age of 48 after a kidney transplant.
References
Further reading
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External links
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Czech statisticians
Czechoslovak mathematicians
1926 births
1974 deaths
Academic staff of Charles University
Czech Technical University in Prague alumni
Mathematical statisticians
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