Jack-Knifing the Ratio and the Product Estimators in Double Sampling.
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.
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.
The exact range of the joined values of several Rényi entropies is determined. The method is based on topology with special emphasis on the orientation of the objects studied. Like in the case when only two orders of the Rényi entropies are studied, one can parametrize the boundary of the range. An explicit formula for a tight upper or lower bound for one order of entropy in terms of another order of entropy cannot be given.
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....