Results 101 to 110 of about 5,704 (194)

Longitudinal Data Regression Analysis Using Semiparametric Modelling

open access: yesRevstat Statistical Journal
Zhang, Leng and Tang (2015) propose joint parametric modelling of the means, variances, and the correlations by decomposing the correlation matrix via hyperspherical co-ordinates and show that this results unconstrained parameterization, fast ...
Abdulla Mamun, Sudhir Paul
doaj  

VarReg: An R package for semi-parametric variance regression

open access: yesSoftwareX
Variance regression is used to model heteroscedasticity in terms of covariates. Algorithms already exist but they may face computational instability due to the required parameter constraints.
Kristy P Robledo, Ian C Marschner
doaj   +1 more source

Fuzzy Semi-Parametric Regression Based on Z-numbers

open access: yesTransactions on Fuzzy Sets and Systems
Semi-parametric regression models are highly valued for combining parametric structure with nonparametric flexibility. However, in real-world situations involving data with inherent uncertainty and variable reliability, classical fuzzy numbers are ...
Mahdi Ali Abdulhussein   +2 more
doaj  

Semiparametric modeling for the cardiometabolic risk index and individual risk factors in the older adult population: A novel proposal.

open access: yesPLoS ONE
The accurate monitoring of metabolic syndrome in older adults is relevant in terms of its early detection, and its management. This study aimed at proposing a novel semiparametric modeling for a cardiometabolic risk index (CMRI) and individual risk ...
Philippe Tagder   +7 more
doaj   +1 more source

Robust Estimation and Inference for Semiparametric and Nonparametric Regression Models

open access: yesMathematics
Parametric regression methods are efficient when correctly specified but are sensitive to model misspecification and outliers. Nonparametric regression offers greater flexibility at the cost of reduced interpretability and susceptibility to the curse of ...
Hamdy F. F. Mahmoud   +2 more
doaj   +1 more source

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