Supreme Court Citation Network Data

Developed by
James H. Fowler and Sangick Jeon

This page contains links to two sets of data on citations in the U.S. Supreme Court from the U.S. Reports. We have spent a lot of time developing this data so if you want to use it please cite the following papers:

These papers describe basic features of the data and how it was retrieved and processed.

 

DATA FILES TO REPLICATE RESULTS IN SOCIAL NETWORKS ARTICLE

A zipped copy of all files is available here.

  • The judicial.csv file is an aggregate results file, including ranks of case authority and hub scores. It is comma delimited and here's a quick key:

    caseid unique numerical id given to each case
    usidUS Reporter id (or numerical equivalent for early Reporters)
    partiesparties to case
    overruledif case was overruled, the caseid of the overruling case is shown
    overruling   if case overruled other case(s), the overruled caseids are shown
    oxfordDoes case appear on Oxford list of salient cases?
    liihcDoes case appear on Legal Information Institute's list of important cases?
    indegnumber of cases that cite this case (as of 2002)
    outdegnumber of cases this case cites
    hubraw hub score (measures how well grounded the case is in the law)
    hubrankrank of hub score
    authraw authority score
    authrankrank of authority score
    betweenbetweeness measure
    incenteigenvector centrality measure

  • The allcites.txt file contains all citations. The first column indicates the caseid of the citing case and the second column indicates the caseid of the citedcase. The columns are space delimited.

The next four files are all matrices of 30288 cases x 203 years (1800-2002). E.g. the element 5,10 is an observation for the case with caseid=5 in 1809.
  • The indegmat.txt file identifies the inward citation count for each case in each year.

  • The outdegmat.txt file identifies the outward citation count for each case in each year. Notice that outward citations never change once a case comes into existence.

  • The authmat.txt file identifies the authority score for each case in each year.

  • The hubmat.txt file identifies the hub score for each case in each year. Notice that hub scores can change from year to year since the authority of cited precedents can change over time.

 

DATA FILES TO REPLICATE RESULTS IN POLITICAL ANALYSIS ARTICLE

There are two files.

  • The Pol_Analysis_ussc_cites.csv.zip file contains a list of all 202,167 citations from USSC majority opinions (the citing case) to USSC majority opinions (the cited case). Lexis IDs are used, but can be converted to USIDs with the second file.

  • The Pol_Analysis_replication.zip file is a Stata file that contains a list of all 2,434,607 case-year observations and includes the following variables:

    namename of each case
    usidUS Reporter id
    lexidLexis id
    amiciz.numstandardized number of amici briefs filed
    auth.numinward importance score
    hub.numoutward importance score
    oxford.numdoes case appear in Oxford Guide's list of important cases?
    cq.numdoes case appear in Congressional Quarterly's list of important cases?
    nyt.numdid case appear on front page of New York Times?
    insc.numnumber of cites from USSC to case in current year
    apin.numnumber of cites from Appeals Courts to case in current year
    stin.numnumber of cites from State Courts to case in current year
    citedyr.numyear case was issued
    citingyr.numcurrent year
    size.numnumber of cases in the network in the current year
    ageage of case
    age.sqsquare of age of case
    insc.num.lagnumber of cites from USSC to case in previous year
    apin.num.lagnumber of cites from Appeals Courts to case in previous year
    stin.num.lagnumber of cites from State Courts to case in previous year
    poutevcent.num.lag   percentile rank outward eigenvector centrality of case in previous year
    pinevcent.num.lagpercentile rank inward eigenvector centrality of case in previous year
    phub.num.lagpercentile rank outward importance score in previous year
    pauth.num.lagpercentile rank inward importance score in previous year
    outsc.num.lagnumber of cites to other USSC majority opinions
    sc.cumul.cites.lagcumulative number of cites from USSC to case up to current year


This work by James H. Fowler is licensed under a
Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License