This study evaluates and compares how accurately three legal citators (Shepard’s, KeyCite, and BCite) identify negative treatment of case law, based on a review of 357 citing relationships that at least one citator labeled as negative. In this sample, Shepard’s and KeyCite missed or mislabeled about one-third of negative citing relationships, while BCite missed or mislabeled over two-thirds. The citators’ relative performance is less clear when examining the most serious citator errors, examples of which can be found in all three citators.
110 Law Library Journal 449-476 (2018)
Hellyer, Paul, "Evaluating Shepard’s, KeyCite, and Bcite for Case Validation Accuracy" (2018). Library Staff Publications. 131.