In "Measuring Statutory Law and Regulations for Empirical Research," Evan Anderson, Charles Tremper, Sue Thomas and Alexander C. Wagenaar provide researchers with a practical how-to guide in applying the scientific method to measure the law for quantitative research. The original PHLR Methods Monograph is an updated and extended version of "Measuring Law for Evaluation Research," published in June 2010 in Evaluation Review. The latest edition is available to download here.
The original monograph is alternatively available via the Social Science Research Network (SSRN), http://ssrn.com/abstract=2021191.