Lee Epstein (Washington University) & Andrew D. Martin (University of Michigan). An Introduction to Empirical Research (Oxford University Press, 2014).
"As the role of empirical methods in traditional legal scholarship and practice grows, new forms of education are needed for today's lawyers. All lawyers asked to present or assess empirical arguments need to understand the fundamental principles of social science methodology that underpin sound empirical research. An Introduction to Empirical Research presents that methodology in a legal context, explaining how empirical analysis can inform legal arguments; how lawyers can set about framing empirical questions, conducting empirical research, analyzing data, and presenting or evaluating the results. The fundamentals of understanding data, statistical models, and the structure of empirical arguments are explained in a way accessible to lawyers with or without formal training in statistics."
—From book jacket