نتایج جستجو برای: correlation matrix
تعداد نتایج: 740763 فیلتر نتایج به سال:
This paper proposes a new model for the dynamics of correlation matrices, where are driven by likelihood score with respect to matrix logarithm matrix. In analogy exponential GARCH volatility, this transformation ensures that matrices remain positive definite, even in high dimensions. For conditional distribution returns, we assume student-t copula explain dependence structure and univariate ma...
Abstract We introduce a method to predict which correlation matrix coefficients are likely change their signs in the future high-dimensional regime, i.e. , when number of features is larger than samples per feature. The stability signs, two-by-two relationships, found depend on three-by-three relationships inspired by Heider social cohesion theory this regime. apply our US and Hong Kong equitie...
Production of nanostructured aluminum matrix composite powder by high energy ball milling is investigated. Scanning electron microscopy analysis as well as the tap and green density measurements were used to optimize the milling time needed for the completion of the mechanical milling process. Also, we studied the particles morphology and size distribution change with milling time and its corre...
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