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Articles 211 - 240 of 1314
Full-Text Articles in Mathematics
Determination Of Quantile Range Of Optimal Hyperparameters Using Bayesian Estimation, Ayoade I. Adewole, Olusoga A. Fasoranbaku
Determination Of Quantile Range Of Optimal Hyperparameters Using Bayesian Estimation, Ayoade I. Adewole, Olusoga A. Fasoranbaku
Tanzania Journal of Science
Bayesian estimations have the advantages of taking into account the uncertainty of all parameter estimates which allows virtually the use of vague priors. This study focused on determining the quantile range at which optimal hyperparameter of normally distributed data with vague information could be obtained in Bayesian estimation of linear regression models. A Monte Carlo simulation approach was used to generate a sample size of 200 data-set. Observation precisions and posterior precisions were estimated from the regression output to determine the posterior means estimate for each model to derive the new dependent variables. The variances were divided into 10 equal …
Bayesian Hetero-Elasticnet (A Gibbs Sampler Approach), Isiaka Oloyede
Bayesian Hetero-Elasticnet (A Gibbs Sampler Approach), Isiaka Oloyede
Tanzania Journal of Science
Combined heteroscedasticity and multicollinearity as dual non-spherical disturbances were experimented asymptotically. A Gibbs Sampler technique was used to investigate the asymptotic properties of hetero-elasticnet estimator with mean squares error (MSE) and bias as performance metrics. The seed was set to 12345; is set at ; Xs variables were generated as follow: the design matrix was generated from the multivariate normal distribution with mean > 0 and variance . and are truncated with Harvey (1976) heteroscedastic error structure; are collinear covariate with pairwise correlation between 0.6 and 0.9, the sample sizes were 25, 100 and 1000. The number of replications of the …
Weighted Statistical A-Optimal Designs For Two-Variable Poisson Regression Model With Application To Fertility Studies, Emmanuel Idowu Olamide, Femi Barnabas Adebola, Olusoga Akin Fasoranbaku
Weighted Statistical A-Optimal Designs For Two-Variable Poisson Regression Model With Application To Fertility Studies, Emmanuel Idowu Olamide, Femi Barnabas Adebola, Olusoga Akin Fasoranbaku
Tanzania Journal of Science
This research extends design optimization to model involving count data. A two-variable Poisson regression model was investigated for A-optimality on a constrained design space and the weights of the optimal design points were obtained. The constructed designs were verified to be A-optimal at 4-point design through the general equivalence theorem. The efficiency of the constructed optimal design was found to be 100% A-efficient. The concept of weighted optimal designs for Poisson regression model was applied to fertility studies. Approximate A-optimal design weights of educational level of women were obtained for each marriage duration period with respect to their places of …
E-Optimal Experimental Designs For Poisson Regression Models In Two And Three Variables, Emmanuel Idowu Olamide, Olusoga Akin Fasoranbaku, Femi Barnabas Adebola
E-Optimal Experimental Designs For Poisson Regression Models In Two And Three Variables, Emmanuel Idowu Olamide, Olusoga Akin Fasoranbaku, Femi Barnabas Adebola
Tanzania Journal of Science
In the context of generalized linear models, most of the recent studies were on logistic regression models and many of them focussed on optimal experimental designs with concentration on D-optimality. In this research, two- and three-variable Poisson regression models were considered for E-optimization on restricted design space [0, 1]. The two-variable Poisson regression model was not optimal at 3-design points, but was found to be E-optimal at 4-design points (1, 1), (0, 0), (0, 1) and (1, 0) with equal design weights of 0.25. The three-variable Poisson regression model was E-optimal at 4-design points (0, 0, 1), (0, 1, 0), …
Elegant Iterative Methods For Solving A Nonlinear Matrix Equation X-A^* E^X A=I, Chacha S Chacha
Elegant Iterative Methods For Solving A Nonlinear Matrix Equation X-A^* E^X A=I, Chacha S Chacha
Tanzania Journal of Science
The nonlinear matrix equation was solved by Gao (2016) via standard fixed point method. In this paper, three more elegant iterative methods are proposed to find the approximate solution of the nonlinear matrix equation namely: Newton’s method; modified fixed point method and a combination of Newton’s method and fixed point method. The convergence of Newton’s method and modified fixed point method are derived. Comparative numerical experimental results indicate that the new developed algorithms have both less computational time and good convergence properties when compared to their respective standard algorithms. Keywords: Hermitian positive definite solution, nonlinear matrix equation, modified fixed point …
Commuting Isometries And Invariant Subspaces In Several Variables., Sankar T. R. Dr.
Commuting Isometries And Invariant Subspaces In Several Variables., Sankar T. R. Dr.
Doctoral Theses
A very general and fundamental problem in the theory of bounded linear operators on Hilbert spaces is to find invariants and representations of commuting families of isometries.In the case of single isometries this question has a complete and explicit answer: If V is an isometry on a Hilbert space â„‹, then there exists a Hilbert space Hu and a unitary operator U on â„‹u such that V on â„‹u and[ S ⊗ IW 0 0 U] ∈ B((l 2 (ℤ+) ⊗ W) ⊕ â„‹u),are unitarily equivalent, whereW = ker V∗ ,is the wandering subspace for V and S is the …
Transfer Of Regularity For Markov Semigroups By Using An Interpolation Technique, Vlad Bally, Lucia Caramellino
Transfer Of Regularity For Markov Semigroups By Using An Interpolation Technique, Vlad Bally, Lucia Caramellino
Journal of Stochastic Analysis
No abstract provided.
Integration By Parts Formula On Solutions To Stochastic Differential Equations With Jumps On Riemannian Manifolds, Hirotaka Kai, Atsushi Takeuchi
Integration By Parts Formula On Solutions To Stochastic Differential Equations With Jumps On Riemannian Manifolds, Hirotaka Kai, Atsushi Takeuchi
Journal of Stochastic Analysis
No abstract provided.
On The Exponential Moments Of Additive Processes, Tsukasa Fujiwara
On The Exponential Moments Of Additive Processes, Tsukasa Fujiwara
Journal of Stochastic Analysis
No abstract provided.
Research On Supply And Demand Of Container Port Handling Capacity—Taking Yangshan Harbor Area Of Shanghai Port As An Example, Liangxi Chen
Research On Supply And Demand Of Container Port Handling Capacity—Taking Yangshan Harbor Area Of Shanghai Port As An Example, Liangxi Chen
World Maritime University Dissertations
No abstract provided.
Research On Port Call Processes To Enable Just-In-Time Arrival Based On Container Shipping Case Study In The Port Of Shanghai, Yang Chen
World Maritime University Dissertations
No abstract provided.
The Formation Mechanism Of China's Export Container Freight Rate, Yuchao Liu
The Formation Mechanism Of China's Export Container Freight Rate, Yuchao Liu
World Maritime University Dissertations
No abstract provided.
Research On The International Linkage Of Chinese Oil Tanker Transport Market Based On The Theory Of New Economic Geospatial, Cheng Miao
World Maritime University Dissertations
No abstract provided.
Research On Optimization Of A Company's Agricultural Products Cold Chain Logistics System, Shizhe Qiao
Research On Optimization Of A Company's Agricultural Products Cold Chain Logistics System, Shizhe Qiao
World Maritime University Dissertations
No abstract provided.
Digitalization In The Port Industry From The Perspectives Of Bibliometric Analysis, Xuyuan Sun
Digitalization In The Port Industry From The Perspectives Of Bibliometric Analysis, Xuyuan Sun
World Maritime University Dissertations
No abstract provided.
Forecasting The Recovery Of The International Container Shipping Market In The Presence Of Covid-19, Tengrongre Wang
Forecasting The Recovery Of The International Container Shipping Market In The Presence Of Covid-19, Tengrongre Wang
World Maritime University Dissertations
No abstract provided.
Comparison Of Port Climate Change Adaptation Strategy And Climate Change Mitigation Strategy Based On The Case Study Of Shanghai Port, Jingjie Xia
World Maritime University Dissertations
No abstract provided.
Research On Shanghai Export Container Freight Index Fluctuation Based On Arma-Garch-X Model, Weihang Xu
Research On Shanghai Export Container Freight Index Fluctuation Based On Arma-Garch-X Model, Weihang Xu
World Maritime University Dissertations
No abstract provided.
Analysis Of The Influence Of Beibu Gulf Port Development On Regional Economy, Hanyue Zhang
Analysis Of The Influence Of Beibu Gulf Port Development On Regional Economy, Hanyue Zhang
World Maritime University Dissertations
No abstract provided.
Cap-And-Trade Or Subsidy? Governments’ Policy Selection On Emission Reduction For Maritime Industry, Wen Zhang
Cap-And-Trade Or Subsidy? Governments’ Policy Selection On Emission Reduction For Maritime Industry, Wen Zhang
World Maritime University Dissertations
No abstract provided.
Study On Amalgamation Of The Logistics Industry And Manufacturing Industry — Shanghai’S Case Study, Haole Zheng
Study On Amalgamation Of The Logistics Industry And Manufacturing Industry — Shanghai’S Case Study, Haole Zheng
World Maritime University Dissertations
No abstract provided.
Analysis Of Covid-19'S Influence On International Logistics Enterprises And Its Countermeasures A Case Study Of Dgf, Zhoutao Ruan
Analysis Of Covid-19'S Influence On International Logistics Enterprises And Its Countermeasures A Case Study Of Dgf, Zhoutao Ruan
World Maritime University Dissertations
No abstract provided.
Research On Multimodal Transport Documents Under One Belt One Road, Wenshuo Cui
Research On Multimodal Transport Documents Under One Belt One Road, Wenshuo Cui
World Maritime University Dissertations
No abstract provided.
The Effect Of New Western Land-Sea Corridor On Ports In East China (A Case Study Of Shanghai Port), Yixin Liu
The Effect Of New Western Land-Sea Corridor On Ports In East China (A Case Study Of Shanghai Port), Yixin Liu
World Maritime University Dissertations
No abstract provided.
Research On Responses Of Container Ports To Global Pandemic, Yirui Qiao
Research On Responses Of Container Ports To Global Pandemic, Yirui Qiao
World Maritime University Dissertations
No abstract provided.
Analysis On The Fluctuation Of China's Imported Iron Ore Freight Rate In Recent, Yizheng Shen
Analysis On The Fluctuation Of China's Imported Iron Ore Freight Rate In Recent, Yizheng Shen
World Maritime University Dissertations
No abstract provided.
Reaserch On Optimal Timing Of Vessel Investment The Introduction Of Ccdg Method, Qianfang Zhang
Reaserch On Optimal Timing Of Vessel Investment The Introduction Of Ccdg Method, Qianfang Zhang
World Maritime University Dissertations
No abstract provided.
Investment Value Analysis Of China's Participation In Port Projects Along The 21st Century Maritime, Xin Zhang
Investment Value Analysis Of China's Participation In Port Projects Along The 21st Century Maritime, Xin Zhang
World Maritime University Dissertations
No abstract provided.
The Management System Of Novcc In China And Its Improvement, Zixuan Zhang
The Management System Of Novcc In China And Its Improvement, Zixuan Zhang
World Maritime University Dissertations
No abstract provided.
Research On The Development Of Shipping Alliance, Xudong Zhao
Research On The Development Of Shipping Alliance, Xudong Zhao
World Maritime University Dissertations
No abstract provided.