Do defendants who plead guilty receive lighter sentences than those with similar charges and attributes who exercise their right to trial? The assertion that they do has long been at the heart of the literature describing and explaining the plea-bargaining process, though it has been questioned in some important work published recently. The existence of sentence differentials is particularly hard to document statistically, because a successfully operating policy of punishing those who go to trial will in fact minimize the number of cases in which the sanction for trial has to be imposed. Examination of data from three California counties, as well as consideration of various theoretical concerns, leads us to argue that sentence differentials are likely to characterize jurisdictions whose disposition patterns are based on inducing most defendants to plead guilty.
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