Measuring the relative location of U.S. Supreme Court justices on an ideological continuum allows us to better understand the politics of the high court. In addition, such measures are an important building blocking of statistical models of the Supreme Court, the separation of powers system, and the judicial hierarchy. This website contains the so-called "Martin-Quinn" measures of judicial ideology developed by Andrew D. Martin (University of Michigan, College of Literature, Science, and the Arts) and Kevin M. Quinn (UC Berkeley School of Law).
The "Martin-Quinn" scores are estimated for every justice serving from the October 1937 term to the present. Currently estimates are available through the October 2015 term.
This material is based upon work supported by the National Science Foundation under Grants SES-01-35855 and SES-01-36679, the Center for Empirical Research in the Law at Washington University, and the Berkeley Law School. Neither the National Science Foundation, Washington University, the University of Michigan, nor Berkeley Law bear any responsibility for this content.