Results 21 to 30 of about 86 (73)

A matrix approach to determine optimal predictors in a constrained linear mixed model

open access: yesOpen Mathematics
For a general vector of all unknown vectors in a constrained linear mixed model (CLMM), this study compared the dispersion matrices of the best linear unbiased predictors with any symmetric matrix for determining the optimality of predictors among others.
Güler Nesrin, Büyükkaya Melek Eriş
doaj   +1 more source

New Versions of Liu-type Estimator in Weighted and non-weighted Mixed Regression Model

open access: yesمجلة بغداد للعلوم, 2020
This paper considers and proposes new estimators that depend on the sample and on prior information in the case that they either are equally or are not equally important in the model.
Mustafa Ismaeel Naif Alheety
doaj  

2000 Mathematics Subject Classification: Primary 62C99, sec-ondary 62C10, 62C20, 62J05

open access: yes, 2016
The paper deals with recovering an unknown vector β ∈ R^p based on the observations Y = Xβ + ∈ξ and Z = X + σζ, where X is an unknown n×p-matrix with n ≥ p, ξ ∈ R^p is a standard white Gaussian noise, ζ is a n × p-matrix with i.i.d. standard Gaussian entries, and ∈, σ ∈ R^+ are known noise levels. It is assumed that X has a large condition number and p
Golubev, Yu., Zimolo, Th.
openaire   +1 more source

A robust and efficient variable selection method for linear regression. [PDF]

open access: yesJ Appl Stat, 2022
Yang Z, Fu L, Wang YG, Dong Z, Jiang Y.
europepmc   +1 more source

Predicting and explaining absenteeism risk in hospital patients before and during COVID-19. [PDF]

open access: yesSocioecon Plann Sci, 2023
Borges A   +4 more
europepmc   +1 more source

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