Time-varying coefficient model estimation through radial basis functions
| Autor: | Juan Sosa, Luis Guillermo Díaz |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Statistics and Probability
Algebraic interior Mixed model FOS: Computer and information sciences Articles Cross-validation Regression Methodology (stat.ME) Polynomial kernel Statistics Applied mathematics Radial basis function Statistics Probability and Uncertainty Linear combination Statistics - Methodology Mathematics Quantile |
| Zdroj: | J Appl Stat |
| Popis: | In this paper, we estimate the dynamic parameters of a time-varying coefficient model through radial kernel functions in the context of a longitudinal study. Our proposal is based on a linear combination of weighted kernel functions involving a bandwidth, centered around a given set of time points. In addition, we study different alternatives of estimation and inference including a Frequentist approach using weighted least squares along with bootstrap methods, and a Bayesian approach through both Markov chain Monte Carlo and variational methods. We compare the estimation strategies mention above with each other, and our radial kernel functions proposal with an expansion based on regression spline, by means of an extensive simulation study considering multiples scenarios in terms of sample size, number of repeated measurements, and subject-specific correlation. Our experiments show that the capabilities of our proposal based on radial kernel functions are indeed comparable with or even better than those obtained from regression splines. We illustrate our methodology by analyzing data from two AIDS clinical studies. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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