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Recognizing cited facts and principles in legal judgements / Olga Shulayeva; Advaith Siddharthan; Adam Wyner

Artificial Intelligence and Law, Volume: 25, Issue: 1, Pages: 107 - 126

Swansea University Author: Wyner, Adam

Abstract

In common law jurisdictions, legal professionals cite facts and legal principles from precedent cases to support their arguments before the court for their intended outcome in a current case. This practice stems from the doctrine of stare decisis, where cases that have similar facts should receive s...

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Published in: Artificial Intelligence and Law
ISSN: 0924-8463 1572-8382
Published: Springer 2017
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa40674
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Abstract: In common law jurisdictions, legal professionals cite facts and legal principles from precedent cases to support their arguments before the court for their intended outcome in a current case. This practice stems from the doctrine of stare decisis, where cases that have similar facts should receive similar decisions with respect to the principles. It is essential for legal professionals to identify such facts and principles in precedent cases, though this is a highly time intensive task. In this paper, we present studies that demonstrate that human annotators can achieve reasonable agreement on which sentences in legal judgements contain cited facts and principles (respectively, j 1⁄4 0:65 and j 1⁄4 0:95 for inter- and intra-annotator agreement). We further demonstrate that it is feasible to automatically annotate sentences containing such legal facts and principles in a supervised machine learning framework based on linguistic features, reporting per category precision and recall figures of between 0.79 and 0.89 for classifying sentences in legal judgements as cited facts, principles or neither using a Bayesian classifier, with an overall j of 0.72 with the human-annotated gold standard.
Keywords: law, machine learning, legal facts, legal principles, corpus
College: Hillary Rodham Clinton School of Law
Issue: 1
Start Page: 107
End Page: 126