Results 41 to 50 of about 355 (84)

Affinely invariant matching methods with discriminant mixtures of proportional ellipsoidally symmetric distributions

open access: yes, 2006
In observational studies designed to estimate the effects of interventions or exposures, such as cigarette smoking, it is desirable to try to control background differences between the treated group (e.g., current smokers) and the control group (e.g ...
Rubin, Donald B., Stuart, Elizabeth A.
core   +1 more source

On comprehensive families of copulas involving the three basic copulas and transformations thereof

open access: yesDependence Modeling
Comprehensive families of copulas including the three basic copulas (at least as limit cases) are useful tools to model countermonotonicity, independence, and comonotonicity of pairs of random variables on the same probability space. In this contribution,
Saminger-Platz Susanne   +4 more
doaj   +1 more source

Relations between ageing and dependence for exchangeable lifetimes with an extension for the IFRA/DFRA property

open access: yesDependence Modeling, 2020
We first review an approach that had been developed in the past years to introduce concepts of “bivariate ageing” for exchangeable lifetimes and to analyze mutual relations among stochastic dependence, univariate ageing, and bivariate ageing.
Nappo Giovanna, Spizzichino Fabio
doaj   +1 more source

The Lukacs-Olkin-Rubin theorem on symmetric cones through Gleason's theorem

open access: yes, 2013
We prove the Lukacs characterization of the Wishart distribution on non-octonion symmetric cones of rank greater than 2. We weaken the smoothness assumptions in the version of the Lukacs theorem of [Bobecka-Weso{\l}owski, Studia Math. 152 (2002), 147-160]
Kołodziejek, Bartosz
core   +1 more source

Nonparametric C- and D-vine-based quantile regression

open access: yesDependence Modeling, 2022
Quantile regression is a field with steadily growing importance in statistical modeling. It is a complementary method to linear regression, since computing a range of conditional quantile functions provides more accurate modeling of the stochastic ...
Tepegjozova Marija   +3 more
doaj   +1 more source

On multidimensional item response theory -- a coordinate free approach

open access: yes, 2007
A coordinate system free definition of complex structure multidimensional item response theory (MIRT) for dichotomously scored items is presented.
Antal, Tamás
core   +1 more source

Copulas, stable tail dependence functions, and multivariate monotonicity

open access: yesDependence Modeling, 2019
For functions of several variables there exist many notions of monotonicity, three of them being characteristic for resp. distribution, survival and co-survival functions. In each case the “degree” of monotonicity is just the basic one of a whole scale.
Ressel Paul
doaj   +1 more source

Time series with infinite-order partial copula dependence

open access: yesDependence Modeling, 2022
Stationary and ergodic time series can be constructed using an s-vine decomposition based on sets of bivariate copula functions. The extension of such processes to infinite copula sequences is considered and shown to yield a rich class of models that ...
Bladt Martin, McNeil Alexander J.
doaj   +1 more source

Preliminary test and Stein-type shrinkage LASSO-based estimators [PDF]

open access: yes, 2018
Peer ...
Arashi, Mohammad, Norouzirad, Mina
core  

Spatial modelling for mixed-state observations

open access: yes, 2008
In several application fields like daily pluviometry data modelling, or motion analysis from image sequences, observations contain two components of different nature.
Hardouin, Cécile, Yao, Jian-Feng
core   +3 more sources

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