Results 1 to 10 of about 12,103 (118)
Bounds for the Distance to the Nearest Correlation Matrix [PDF]
SIAM Journal on Matrix Analysis and Applications, 2016 Summary: In a wide range of practical problems correlation matrices are formed in such a way that, while symmetry and a unit diagonal are ensured, they may lack semidefiniteness. We derive a variety of new upper bounds for the distance from an arbitrary symmetric matrix to the nearest correlation matrix.
Nicholas Higham, Nataša Strabić
exaly +4 more sources
Nonnegative matrix factorization of a correlation matrix
Linear Algebra and Its Applications, 2009 A correlation matrix is a symmetric positive-semidefinite \(n \times n\) matrix \(C\) which has a unit main diagonal. The basic question is essentially concerned with finding a factorization of the type \(C \approx AA^T\) such that \(AA^T\) should be a low-rank approximation of \(C\) together with an additional nonnegativity constraint.
C W Oosterlee
exaly +4 more sources
The Casual Relationship Between Debt and Profitability: The Case of Italy [PDF]
Athens Journal of Business & Economics, 2016 This paper examines the impact of debt on corporate profitability using a longitudinal sample of 7,370 Italian SMEs operating in the commerce sector during 2006-2010.
Marco Muscettola, Francesco Naccarato
doaj +1 more source
Life, 2022 Nitrogen (N) is a highly essential macronutrient for plant root growth and grain yield (GY). To assess the relationship among N, root traits, and the yield of boro (dry season irrigated) rice, a pot experiment was performed in the Department of Agronomy,
Md. Salahuddin Kaysar +10 more
doaj +1 more source
Designs, 2022 This work presents an aerodynamic and structural optimization for a Droop Nose Leading Edge Morphing airfoil as a high lift device for the UAS-S45. The results were obtained using three optimization algorithms: coupled Particle Swarm Optimization-Pattern
Musavir Bashir +5 more
doaj +1 more source
Improved Approximation and Visualization of the Correlation Matrix [PDF]
The American Statistician, 2023 20 pages, 4 ...
Jan Graffelman, Jan de Leeuw
openaire +4 more sources
Econometric analysis of the use of biological assets in agricultural organizations
Статистика и экономика, 2020 The purpose of the study. The purpose is to analysis the use of biological assets through econometric models and quantifies the relationship between economic indicators of agricultural activity.
A. O. Ovcharov, A. M. Terekhov
doaj +1 more source
Video-Tachometer Methodology for Wind Turbine Rotor Speed Measurement
Sensors, 2020 The measurement of the rotational speed of rotating machinery is typically performed based on mechanical adherence; for example, in encoders. Nevertheless, it can be of interest in various types of applications to develop contactless vision-based ...
Francesco Natili +3 more
doaj +1 more source
Signal and noise in correlation matrix [PDF]
Physica A: Statistical Mechanics and its Applications, 2004 17 pages, 3 figures, corrected typos, revtex style changed to ...
Burda, Zdzisław +3 more
openaire +3 more sources
Meta-Analysis of SNP-Environment Interaction With Overlapping Data
Frontiers in Genetics, 2020 Meta-analysis, which combines the results of multiple studies, is an important analytical method in genome-wide association studies. In genome-wide association studies practice, studies employing meta-analysis may have overlapping data, which could yield
Qinqin Jin, Qinqin Jin, Gang Shi
doaj +1 more source