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An R Companion to Applied Regression

An R Companion to Applied Regression

Third Edition

October 2018 | 608 pages | SAGE Publications, Inc
An R Companion to Applied Regression is a broad introduction to the R statistical computing environment in the context of applied regression analysis. John Fox and Sanford Weisberg provide a step-by-step guide to using the free statistical software R, an emphasis on integrating statistical computing in R with the practice of data analysis, coverage of generalized linear models, and substantial web-based support materials.

The Third Edition has been reorganized and includes a new chapter on mixed-effects models, new and updated data sets, and a de-emphasis on statistical programming, while retaining a general introduction to basic R programming. The authors have substantially updated both the car and effects packages for R for this edition, introducing additional capabilities and making the software more consistent and easier to use. They also advocate an everyday data-analysis workflow that encourages reproducible research. To this end, they provide coverage of RStudio, an interactive development environment for R that allows readers to organize and document their work in a simple and intuitive fashion, and then easily share their results with others. Also included is coverage of R Markdown, showing how to create documents that mix R commands with explanatory text. 

1. Getting Started with R and RStudio
Projects in RStudio

R Basics

Fixing Errors and Getting Help

Organizing Your Work in R and RStudio

An Extended Illustration

R Functions for Basic Statistics

Generic Functions and Their Methods*

2. Reading and Manipulating Data
Data Input

Managing Data

Working With Data Frames

Matrices, Arrays, and Lists

Dates and Times

Character Data

Large Data Sets in R*

Complementary Reading and References

3. Exploring and Transforming Data
Examining Distributions

Examining Relationships

Examining Multivariate Data

Transforming Data

Point Labeling and Identication

Scatterplot Smoothing

Complementary Reading and References

4. Fitting Linear Models
The Linear Model

Linear Least-Squares Regression

Predictor Effect Plots

Polynomial Regression and Regression Splines

Factors in Linear Models

Linear Models with Interactions

More on Factors

Too Many Regressors*

The Arguments of the lm Function

Complementary Reading and References

5. Standard Errors, Confidence Intervals, Tests
Coefficient Standard Errors

Confidence Intervals

Testing Hypotheses About Regression Coefficients

Complementary Reading and References

6. Fitting Generalized Linear Models
The Structure of GLMs

The glm() Function in R

GLMs for Binary-Response Data

Binomial Data

Poisson GLMs for Count Data

Loglinear Models for Contingency Tables

Multinomial Response Data

Nested Dichotomies

The Proportional-Odds Model


Arguments to glm()

Fitting GLMs by Iterated Weighted Least-Squares*

Complementary Reading and References

7. Fitting Mixed-Effects Models
Background: The Linear Model Revisited

Linear Mixed-Effects Models

Generalized Linear Mixed Models

Complementary Reading

8. Regression Diagnostics

Basic Diagnostic Plots

Unusual Data

Transformations After Fitting a Regression Model

Non-Constant Error Variance

Diagnostics for Generalized Linear Models

Diagnostics for Mixed-Effects Models

Collinearity and Variance-Inflation Factors

Additional Regression Diagnostics

Complementary Reading and References

9. Drawing Graphs
A General Approach to R Graphics

Putting It Together: Local Linear Regression

Other R Graphics Packages

Complementary Reading and References

10. An Introduction to R Programming
Why Learn to Program in R?

Defining Functions: Preliminary Examples

Working With Matrices*

Conditionals, Loops, and Recursion

Avoiding Loops

Optimization Problems*

Monte-Carlo Simulations*

Debugging R Code*

Object-Oriented Programming in R*

Writing Statistical-Modeling Functions in R*

Organizing Code for R Functions

Complementary Reading and References



Student Study Site

An accompanying website for the book found at provides:

  • R scripts for examples by chapter
  • Data files used in the book
  • The car package (Companion to Applied Regression), an accompanying software for regression diagnostics and other regression-related tasks
  • Other resources to help students get the most out of the text

An R Companion to Applied Regression continues to provide the most comprehensive and user-friendly guide to estimating, interpreting, and presenting results from regression models in R.”

Christopher Hare
University of California, Davis

“This is the best book I’ve read for teaching the modern practice of regression. By going deeply into both R and applied regression, it manages to use each topic to motivate and illustrate the other. The whole is much greater than sum of the parts because each thread so effectively reinforces the other. There are many nice surprises in this new edition.  R Studio and markdown are used to encourage a reproducible workflow. There’s an excellent and accessible chapter on mixed and longitudinal data that expands the reach of regression methods to the much more complex data structures typical of current practice. Like its predecessors, this edition is a model of clear, thoughtful exposition. It’s an outstanding contribution to the teaching and practice of regression.”

Georges Monette
York University

“This is an impressive update to a book I have long admired. The authors have brought the description of how to do data analysis and plots of Applied Regression related data to a modern and more comprehensive level.”

Michael Friendly
York University

Made a good supplement with a heavy emphasis on R.

Mike Minnotte
Mathematics Dept, University Of North Dakota
February 11, 2022

John David Fox

John Fox received a BA from the City College of New York and a PhD from the University of Michigan, both in Sociology. He is Professor Emeritus of Sociology at McMaster University in Hamilton, Ontario, Canada, where he was previously the Senator William McMaster Professor of Social Statistics. Prior to coming to McMaster, he was Professor of Sociology, Professor of Mathematics and Statistics, and Coordinator of the Statistical Consulting Service at York University in Toronto. Professor Fox is the author of many articles and books on applied statistics, including \emph{Applied Regression Analysis and Generalized Linear Models, Third Edition... More About Author

Harvey Sanford Weisberg

Sanford Weisberg is Professor Emeritus of statistics at the University of Minnesota.  He has also served as the director of the University's Statistical Consulting Service, and has worked with hundreds of social scientists and others on the statistical aspects of their research.  He earned a BA in statistics from the University of California, Berkeley, and a Ph.D., also in statistics, from Harvard University, under the direction of Frederick Mosteller.  The author of more than 60 articles in a variety of areas, his methodology research has primarily been in regression analysis, including graphical methods, diagnostics, and... More About Author

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ISBN: 9781544336473