Vogt and Johnson have ordered the growing research literature on the use of CRA (Correlation and Regression Analysis) according to its natural steps. Each step in this logical progression constitutes a volume in this collection: Volume One: Regression and Its Correlational Foundations and Concomitants. Volume Two: Factor Analysis, Regression Diagnostics, and Model Building. Volume Three: Data Transformations, Curvilinear Regression, and Logistic Regression. Volume Four: Multi-Level Regression Modeling, Structural Equation Modeling and Mixed Regression.