Zobrazeno 1 - 10
of 87
pro vyhledávání: '"Marilena Mitrouli"'
Publikováno v:
Mathematics, Vol 9, Iss 15, p 1806 (2021)
In this work, we present numerical methods appropriate for parameter estimation in high-dimensional statistical modelling. The solution of these problems is not unique and a crucial question arises regarding the way that a solution can be found. A co
Externí odkaz:
https://doaj.org/article/b448df8c45324ba3ba8b7336ce64cba2
Publikováno v:
Mathematics, Vol 9, Iss 12, p 1432 (2021)
In this paper, we study estimates for quadratic forms of the type xTA−mx, m∈N, for symmetric matrices. We derive a general approach for estimating this type of quadratic form and we present some upper bounds for the corresponding absolute error.
Externí odkaz:
https://doaj.org/article/33f1a55f3829495f93dfd7d1759ea8cc
Publikováno v:
Mathematics, Vol 9, Iss 11, p 1249 (2021)
Face recognition and identification are very important applications in machine learning. Due to the increasing amount of available data, traditional approaches based on matricization and matrix PCA methods can be difficult to implement. Moreover, the
Externí odkaz:
https://doaj.org/article/9cedb2c765524a738fa76d8a5c07c8f9
Publikováno v:
2022 12th International Conference on Dependable Systems, Services and Technologies (DESSERT).
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e053236ba9dd66cf58836f92d244db98
https://doi.org/10.1109/dessert58054.2022.10018672
https://doi.org/10.1109/dessert58054.2022.10018672
Autor:
Marilena Mitrouli, Alessandro Buccini, Lothar Reichel, Omar De la Cruz Cabrera, Christos Koukouvinos
Publikováno v:
Communications in Statistics - Simulation and Computation. :1-22
In many real world problems it is of interest to ascertain which factors are most relevant for determining a given outcome. This is the so-called variable selection problem. The present paper propo...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f9ae2632c2e192c333c73ea932a5c7fa
https://doi.org/10.1080/03610918.2021.1961151
https://doi.org/10.1080/03610918.2021.1961151
The aim of variable selection is the identification of the most important predictors that define the response of a linear system. Many techniques for variable selection use a constrained least squares ( LS ) formulation in which the constraint is imp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::799e11f86bc9850970a2d56cbe590058
https://eprints.whiterose.ac.uk/179180/1/RevisedWMK.pdf
https://eprints.whiterose.ac.uk/179180/1/RevisedWMK.pdf
Publikováno v:
Communications in Statistics - Simulation and Computation. 51:1542-1563
The solution of the penalized least squares problems depends on a tuning parameter. A popular tool for specifying the tuning parameter is the generalized cross-validation (GCV). In this work, we ut...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c92ea368b3213d0354d78d1bfd78aaaa
https://doi.org/10.1080/03610918.2019.1676436
https://doi.org/10.1080/03610918.2019.1676436
Autor:
Marilena Mitrouli, Paraskevi Fika
Publikováno v:
Journal of Computational and Applied Mathematics. 355:91-105
For large scale problems, the explicit computation of the inverse of a given matrix has high computational complexity and therefore a crucial problem is its efficient approximation. In this work, we present a readily implementable procedure for appro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c71b939701234724ad809fc895f1c791
https://doi.org/10.1016/j.cam.2019.01.014
https://doi.org/10.1016/j.cam.2019.01.014
Publikováno v:
The Electronic Journal of Linear Algebra. 35:482-496
This work proposes a fast estimate for the generalized cross-validation function when the design matrix of an experiment has correlated columns. The eigenvalue structure of this matrix is used to derive probability bounds satisfied by an appropriate
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d7e3cff85437546e8f90cc5b6f6fe54d
https://doi.org/10.13001/1081-3810.4090
https://doi.org/10.13001/1081-3810.4090
We consider the computation of generalized inverses of the graph Laplacian for both undirected and directed graphs, with a focus on the group inverse and the closely related absorption inverse. These generalized inverses encode valuable information a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::282d3417aee4f1c7f8775d512e907788
https://hdl.handle.net/11384/84984
https://hdl.handle.net/11384/84984