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Regression Calibration with Instrumental Variables and Non-parametric Regression for Longitudinal Data

Regression Calibration with Instrumental Variables and Non-parametric Regression for Longitudinal Data
Author: Stefan Sillau
Publisher:
Total Pages: 156
Release: 2013
Genre:
ISBN:

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Regression usually assumes exactly known values for the covariates, with random error in the response only. In some situations the covariates themselves must be estimated using proxy variables and models of instrumental variables. The following study seeks to extend methods for estimating regression parameters and inferential statistics under conditions of longitudinal data when interactions between covariates are involved. Longitudinal data introduces random subject effects and correlated error terms into models for the covariate and the response. Interaction introduce second order terms and cross terms. Standard errors and confidence intervals for the parameters of interest are studied. Substituting instrumental models and back transforming, with some approximations, yields acceptable results in a range of cases. In addition, for some situations a non-parametric surface fit is desired. Use of local likelihood methods is explored for longitudinal data for both normal and count outcomes, and an algorithm is proposed.


Nonparametric Regression Methods for Longitudinal Data Analysis

Nonparametric Regression Methods for Longitudinal Data Analysis
Author: Hulin Wu
Publisher: John Wiley & Sons
Total Pages: 401
Release: 2006-05-12
Genre: Mathematics
ISBN: 0470009667

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Incorporates mixed-effects modeling techniques for more powerful and efficient methods This book presents current and effective nonparametric regression techniques for longitudinal data analysis and systematically investigates the incorporation of mixed-effects modeling techniques into various nonparametric regression models. The authors emphasize modeling ideas and inference methodologies, although some theoretical results for the justification of the proposed methods are presented. With its logical structure and organization, beginning with basic principles, the text develops the foundation needed to master advanced principles and applications. Following a brief overview, data examples from biomedical research studies are presented and point to the need for nonparametric regression analysis approaches. Next, the authors review mixed-effects models and nonparametric regression models, which are the two key building blocks of the proposed modeling techniques. The core section of the book consists of four chapters dedicated to the major nonparametric regression methods: local polynomial, regression spline, smoothing spline, and penalized spline. The next two chapters extend these modeling techniques to semiparametric and time varying coefficient models for longitudinal data analysis. The final chapter examines discrete longitudinal data modeling and analysis. Each chapter concludes with a summary that highlights key points and also provides bibliographic notes that point to additional sources for further study. Examples of data analysis from biomedical research are used to illustrate the methodologies contained throughout the book. Technical proofs are presented in separate appendices. With its focus on solving problems, this is an excellent textbook for upper-level undergraduate and graduate courses in longitudinal data analysis. It is also recommended as a reference for biostatisticians and other theoretical and applied research statisticians with an interest in longitudinal data analysis. Not only do readers gain an understanding of the principles of various nonparametric regression methods, but they also gain a practical understanding of how to use the methods to tackle real-world problems.


Practical Longitudinal Data Analysis

Practical Longitudinal Data Analysis
Author: David J. Hand
Publisher: Routledge
Total Pages: 248
Release: 2017-10-06
Genre: Mathematics
ISBN: 1351422650

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This text describes regression-based approaches to analyzing longitudinal and repeated measures data. It emphasizes statistical models, discusses the relationships between different approaches, and uses real data to illustrate practical applications. It uses commercially available software when it exists and illustrates the program code and output. The data appendix provides many real data sets-beyond those used for the examples-which can serve as the basis for exercises.


Applied Nonparametric Regression

Applied Nonparametric Regression
Author: Wolfgang Härdle
Publisher: Cambridge University Press
Total Pages: 356
Release: 1990
Genre: Business & Economics
ISBN: 9780521429504

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This is the first book to bring together in one place the techniques for regression curve smoothing involving more than one variable.


Nonparametric and Semiparametric Regression with Missing Data

Nonparametric and Semiparametric Regression with Missing Data
Author: Lu Wang
Publisher:
Total Pages: 280
Release: 2008
Genre:
ISBN:

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In this dissertation, we consider nonparametric and semiparametric regression for both independent and longitudinal data with missing at random (MAR). The thesis consists of three chapters. In chapter 1, we focus on nonparametric regression of a scalar outcome on a covariate when the outcome is MAR. We show that the usual nonparametric kernel regression estimation based only on complete cases is generally inconsistent. We propose inverse probability weighted (IPW) kernel estimating equations (KEEs) and a class of augmented IPW (AIPW) KEEs. Both approaches do not require specification of a parametric model for the error distribution. We show that the IPW kernel estimator is consistent when the probability that a sampling unit is observed, i.e., the selection probability, is known by design or is estimated using a correctly specified model. We further show that the AIPW kernel estimator is double-robust in the sense that it is consistent if either the model for the selection probability or the model for the conditional mean of the outcome given covariates and auxiliary variables is correctly specified, not necessarily both. We argue that adequate augmentation terms in the AIPW KEEs help increase the efficiency of the estimator. We study the asymptotic properties of the proposed IPW and AIPW kernel estimators, perform simulations to evaluate their finite sample performance, and apply to the analysis of the AIDS Costs and Services Utilization Survey data.