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Jurist-Derived Judicial Ideology Scores

(JuDJIS)

About

The Jurist-Derived Judicial Ideology Scores (JuDJIS) project is a new measure of judicial ideology — and other traits — that will locate on a single scale nearly every Article III U.S. federal judge serving since 1990 (approximately 4,900 judges). Project development began in 2015, and the first phase, Circuit: Ideology, will be released in late 2023; this release estimates the ideology of essentially every U.S. Court of Appeals judge who’s served from 1990-2022: at least 450 judges.

The quantitative measure is derived from tens of thousands of qualitative evaluations — an ongoing, third-party initiative conducted over three decades — by a representative sample of thousands of legal experts, i.e., jurists, familiar with the judges’ approaches to judging. The full dataset comprises dynamic, interval-level, and multi-dimensional data….

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Research Using JuDJIS [to come…]

Theory, Method, & Validation

  • Kevin L. Cope, An Expert-Sourced Measure of Judicial Ideology (2024) (theory, method, and validation) (working paper) [SSRN]
  • Kevin L. Cope, The Conceptual Challenge to Measuring Ideology, in The Oxford Handbook of Comparative Judicial Behavior (Epstein et al. eds.) (forthcoming 2024) (theory) [SSRN]
  • Kevin L. Cope & Li ZhangA Hierarchical Dictionary Method for Analyzing Legal and Political Texts Via Nested Ngrams (2024) (text analysis and hierarchical ngram explanation) (working paper) [SSRN]
  • Kevin L. Cope, Ideology in the Federal Judiciary (2024) (working paper)

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Discussion [to come…]

Data for Download

Please cite as: Kevin L. Cope, An Expert-Sourced Measure of Judicial Ideology (2024) (working paper)

U.S. Circuit Courts

U.S. District Courts

JuDJIS District:

Ideology

(forthcoming 2024)

JuDJIS Circuit:

Ability

(forthcoming 2024)

JuDJIS District:

Ability

(forthcoming 2024)

JuDJIS Circuit:

Demeanor

(forthcoming 2024)

JuDJIS District:

Demeanor

(forthcoming 2024)

JuDJIS Circuit:

Argument

(forthcoming 2024)

JuDJIS District:

Settlement

(forthcoming 2024)

JuDJIS Circuit:

Quality

(forthcoming 2024)

JuDJIS District:

Quality

(forthcoming 2024)

U.S. Supreme Court (forthcoming 2025)

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