Add to ORKGConventional wisdom holds that appointed judges are superior to elected judges because appointed judges are less vulnerable to political pressure. However, there is little empirical evidence for this view. Using a data set of state high court opinions,we construct measures for three aspects of judicial performance: effort, skill, and independence. The measures permit a test of the relationship between performance and the four primary methods of state high court judge selection: partisan election, non-partisan election, merit plan, and appointment. Appointed judges write higher quality opinions than elected judges do, but elected judges write more opinions, and the evidence suggests that the large quantity difference makes up for the small q...