From Schubert’s Judicial Mind to Spaeth’s U.S. Supreme Court Judicial Data Base
Paul Djupe and Lee Epstein

American Journal of Political Science 42 (July): 1012-1019 (1998)
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Abstract
Judicial specialists have been rather inactive participants in contemporary debates over the replication and verification of data. In part, this reflects the fact that they have already developed data sets (e.g., Spaeth's U.S. Supreme Court Judicial Data Base) designed to meet these concerns. But such was not always the case: Many of the foundational studies in the field relied on information that would not pass muster under current standards governing data collection. We crossvalidate a model from one of these studies (Epstein, Walker, and Dixon 1989), which largely relied on data collected by Schubert (1976), with data derived from the Spaeth Data Base.

keywords: Supreme Court data, Spaeth Judicial Data, Schubert, crossvalidation, judicial decisions, data reliability, reproducibility, operational definitions, empirical research.