"An R and S-Plus® Companion to Multivariate Analysis" is a comprehensive textbook that focuses on the analysis of multivariate data. It is aimed at students and researchers working in the fields of applied statistics and social sciences. The book provides a detailed introduction to the core methods of multivariate analysis and explains the underlying theory for each method covered. Special attention is given to practical application, as the necessary R and S-PLUS codes are provided for each analysis. Differences between the two software packages are also highlighted, helping readers choose the software that best suits their needs. The clear structure and practice-oriented approach make this book a valuable tool for anyone dealing with the challenges of multivariate data.