The idea for this book grew over decades of teaching introductory and intermediate quantitative methods classes for graduate students in Political Science and Public Policy at the
University of Oklahoma, Texas A&M, and the University of New Mexico. Despite adopting (and then discarding) a wide range of textbooks, we were frustrated with inconsistent    terminology, misaligned emphases, mismatched examples and data, and (especially) poor
conntions between the presentation of theory and the practice of data analysis. 
The cost of textbooks and the associated statistics packages for students seemed to us to be, frankly,outrageous. So, we decided to write our own book that students can download as a free
PDF, and to couple it with R, an open-source (free) statistical program, and data from the Meso-Scale Integrated Socio-geographic Network (M-SISNet), a quarterly survey of approximately 1,500 households in Oklahoma that is conducted with support of the National Science Foundation (Grant No. IIA-1301789). Readers can learn about and download the
data at http://crcm.ou.edu/epscordata/.
By intent, this book represents an open-ended group project that changes over time as new ideas and new instructors become involved in teaching graduate methods in the University of Oklahoma Political Science Department. 
The first edition of the book grew from lecture notes and slides that Hank Jenkins-Smith used in his methods classes. 
The second edition was amended to encompass material from Gary Copeland’s introductory graduate methods classes. 
The third edition (this one!) was updated by Joseph Ripberger, who currently manages and uses the book in his introductory and intermediate quantitative methods courses for Ph.D. students in the University of Oklahoma Political Science
Department.