While conceding that "judges matter" as a general matter, a recent paper, Do Judges Matter?, considers a slightly narrower question: what about judges matters when it comes to the more mundane aspects incident to the business of judging?" More specifically, the authors, Yun-chien Chang (Cornell) and Geoffrey Miller (NYU), explore potential relationships "between a judge’s personal characteristics and the day-to-day business of courts – the writing of opinions, the use of citations, the frequency of dissent, and like factors."
Exploiting a hand-collected data set of 4,591 substantive decisions issued by 48 state supreme courts in 2003 (excluding Alaska and Hawaii), the paper finds that while state supreme courts themselves vary in how they carry out their judicial business (e.g., citation distributions, frequency of dissents), personal characteristics of judges, by contrast, have only a "negligible impact." The abstract follows.
"An extensive literature examines whether characteristics of judges correlate with votes on cases. These studies generally consider the judges’ votes on the merits of cases. Examining a data set of 4,591 decisions issued by 48 state supreme courts in 2003, we consider whether judges’ personal features affect their opinion writing. We find virtually no significant differences along any of the dimensions under review. Judicial characteristics matter only indirectly — ideological differences increase dissensus in public-law cases, which increases opinion length and citation numbers. Our study suggests that when carrying out the ordinary business of courts, judges are almost all the same."
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