
Aside from code samples (even for R beginners) which include additional comments, there is also an online tutorial on Structural Equation Modeling included in the book webpage which make the book content easier to learn. In addition, the book also extends discussion beyond the methodological aspect of using R in scientific computing by providing technical and practical approach in some of the methodologies (e.g. "choosing the number of components to retain in Principal Component Analysis", "Rasch analysis using linear algebra and a
paired comparisons matrix", "Exploratory factor analysis and reflective
constructs").
Highly recommended book!