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Jacobians of certain transformations of singular matrices

José A. Díaz-García, Ramón Gutiérrez-Jáimez (2009)

Applicationes Mathematicae

In this study various Jacobians of transformations of singular random matrices are found. An alternative proof of Uhlig's first conjecture (Uhlig (1994)) is proposed. Furthermore, we propose various extensions of this conjecture under different singularities. Finally, an application of the theory of singular distributions is discussed.

Jak viktoriánský polyhistor objevil korelační analýzu

Petr Emanovský (2022)

Učitel matematiky

Regresní a korelační analýza patří mezi nejčastěji používané metody statistického zpracování dat. Objev této metody je spojen se jménem geniálního myslitele 19. století  Francise Galtona. Článek je zaměřen na život a dílo tohoto významného vědce a zejména na přiblížení jeho myšlenek při tvorbě základních pojmů regresní a korelační analýzy.

Joint weak hazard rate order under non-symmetric copulas

Franco Pellerey, Fabio Spizzichino (2016)

Dependence Modeling

A weak version of the joint hazard rate order, useful to stochastically compare not independent random variables, has been recently defined and studied in [4]. In the present paper, further results on this order are proved and discussed. In particular, some statements dealing with the relationships between the jointweak hazard rate order and other stochastic orders are generalized to the case of non symmetric copulas, and its relations with some multivariate aging notions (studied in [2]) are presented....

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