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Replication Data for Quality Over Quantity: Amici Influence and Judicial Decision Making

Resource Type
Dataset : observational data
  • Box-Steffensmeier, Janet M. (The Ohio State University)
  • Christenson, Dino P. (Boston University)
  • Hitt, Matthew (The Ohio State University)
Other Title
  • Archival Version (Subtitle)
Publication Date
Funding Reference
  • National Science Foundation
Free Keywords
judicial decision making; special interest groups; United States Supreme Court
  • Abstract

    Interest groups often make their preferences known on cases before the U.S. Supreme Court via amicus curiae briefs. In evaluating the case and related arguments, we posit that judges take into account more than just the number of supporters for the liberal and conservative positions. Specifically, judges' decisions may also reflect the relative power of the groups. We use network position to measure interest group power in U.S. Supreme Court cases from 1946 to 2001. We find that the effect of interest group power is minimal in times of heavily advantaged cases. However, when the two sides of a case are approximately equal in the number of briefs, such power is a valuable signal to judges. We also show that justice ideology moderates the effect of liberal interest group power. The results corroborate previous findings on the influence of amicus curiae briefs and add a nuanced understanding of the conditions under which the quality and reputation of interest groups matter, not just the quantity.
  • Table of Contents


    • DS1: Dataset
Temporal Coverage
  • 1946 / 2001
    Collection date: 1946--2001
Geographic Coverage
  • United States
Collection Mode
  • The zipped package contains Stata files pertaining to the publication.

    These data are part of ICPSR's Publication-Related Archive and are distributed exactly as they arrived from the data depositor. ICPSR has not checked or processed this material. Users should consult the investigator(s) if further information is desired.

Funding insitution(s): National Science Foundation (No. 1124386 and No. 1124369.).
This version of the study is no longer available on the web. If you need to acquire this version of the data, you have to contact ICPSR User Support (
Alternative Identifiers
  • 34838 (Type: ICPSR Study Number)
  • Is previous version of
    DOI: 10.3886/ICPSR34838.v1
  • Box-Steffensmeier, Janet M., Christenson, Dino P., Hitt, Matthew. Quality over quantity: Amici influence and judicial decision making. American Political Science Review.107, (3), 446-460.2013.
    • ID: 10.1017/S000305541300021X (DOI)

Update Metadata: 2015-08-05 | Issue Number: 6 | Registration Date: 2015-06-16

Box-Steffensmeier, Janet M.; Christenson, Dino P.; Hitt, Matthew (2013): Replication Data for Quality Over Quantity: Amici Influence and Judicial Decision Making. Archival Version. Version: v0. ICPSR - Interuniversity Consortium for Political and Social Research. Dataset.