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Articles 121 - 122 of 122
Full-Text Articles in Physical Sciences and Mathematics
Bayesian Ensemble Of Regression Trees For Multinomial Probit And Quantile Regression, Bereket P. Kindo
Bayesian Ensemble Of Regression Trees For Multinomial Probit And Quantile Regression, Bereket P. Kindo
Theses and Dissertations
This dissertation proposes multinomial probit Bayesian additive regression trees (MPBART), ordered multiclass Bayesian additive classification trees (O-MBACT) and Bayesian quantile additive regression trees (BayesQArt) as extensions of BART - Bayesian additive regression trees for tackling multinomial choice, multiclass classification, ordinal regression and quantile regression problems. The proposed models exhibit very good predictive performances. In particular, ranking among the top performing procedures when non-linear relationships exist between the response and the predictors. The proposed procedures can readily be applied on data sets with the number of predictors larger than the number of observations.
MPBART is sufficiently flexible to allow inclusion of …
Modeling Of Structural Relaxation By A Variable-Order Fractional Differential Equation, Su Yang
Modeling Of Structural Relaxation By A Variable-Order Fractional Differential Equation, Su Yang
Theses and Dissertations
In physical point of view, relaxation usually describes the return from a perturbed system into equilibrium and each process has its own characteristic relaxation time. In 1946, Tool first formulated the notion of fictive temperature to characterize the structure of a glass-forming melt. Since then, people used to simulate structural relaxation by first order model. Since fractional-based models have not widely applied in modeling the fictive temperature, I want to explore the the possibility of modeling structural relaxation by fractional differential equation.
In this thesis, I will first introduce the definitions of two different kinds of fractional derivatives: Riemann-Liouville fractional …