If you’re interested in learning more about data analysis, you should get Applied Regression Analysis and Generalized Linear Models PDF by John Fox. This textbook is suitable for students and professionals who need a solid grounding in statistics. Developed with sociologists in mind, this text focuses on generalized linear models and regression analysis. Parametric regression models require the user to specify the functional form of the data before fitting it to the model. Nonparametric regression models, on the other hand, are not statistically valid.