Disclaimer: These appendices are provided for readers of Fox and Weisberg, An R Companion to Applied Regression, 2nd Edition (Sage, 2011). Others are welcome to use them, and we are of course always interested in learning about errors in the text or appendices, but if you are not a reader of the book, please do not ask us questions about the appendices.
Cox Regression for Survival Data
Multivariate Linear Models
Mixed-Effects Models (from the first edition, to be updated)
Multiple Imputation of Missing Data (not yet available)