Data Download

NOMINATE and Related Data

1. DW-NOMINATE

   Weekly Constant Space DW-NOMINATE Scores
   Rank Orderings all Houses and Senates -- 1^st to 113^th Congresses
   Common Space DW-NOMINATE Scores 1^st to 113^th Congresses
   DW-NOMINATE Scores 1^st to 113^th Congresses
   DW-NOMINATE Probabilities for Legislator Choices: 1^st to 113^th Congresses
   Cutting Line Angle Files for the House and Senate 1^st to 113^th Congresses
   One-Congress-at-a-Time DW-NOMINATE (Nokken-Poole) data for the House and Senate 1^st to 113^th Congresses
   Political Polarization Measures: 1879 - 2014
   Party Unity Scores by Democrat and Republican Members: 1857 - 2014
   Party Unity Scores by Congress: 1879 - 2014
   Percent Voting on the Winning Side by Member -- Houses/Senates 1 - 113
   Party and Chamber Medians, 1 - 113 Congresses (DW-NOMINATE Scores)
   DW-NOMINATE Output by Rohde Codes, Houses 83 - 108
   Chamber Means and Winning Policy Means for 1^st Dimension, 1 - 113 Congresses (DW-NOMINATE Scores)
   Republican and Democratic Party Splits on all roll calls cast in Congresses 35 - 113
   DW-NOMINATE Roll Call Coordinates and Issue Codes for Houses 1 to 113
   DW-NOMINATE Roll Call Coordinates and Issue Codes for Senates 1 to 113
   DW-NOMINATE Scores for Congressional Leaders: 1789 - 2000
   Congressional Quarterly Key Votes 1949 - 2012
   

2. W-NOMINATE

   W-NOMINATE in R Program with Examples
   W-NOMINATE Scores With Bootstrapped Standard Errors
   W-NOMINATE scores by year for 1939 - 1998
   
   
   

3. Optimal Classification (OC)

   Optimal Classification in R Program with Examples
   Optimal Classification Scores: Houses/Senates 1 - 113 in a Common Space
   
   
   

4. Common Space Scores

   Common Space Scores 75^th to 113^th Congresses
   
   Format of the Common Space Scores
   
   
   

5. D-NOMINATE (1986-89)

   The original D-NOMINATE Legislator scores for Congresses 1 to 99
   The original D-NOMINATE Roll Call Coordinates and Issue Codes for Houses 1 to 99
   The original D-NOMINATE Roll Call Coordinates and Issue Codes for Senates 1 to 99
   

Software

R Package for alpha-NOMINATE
Bayesian Aldrich-McKelvey Scaling
Bakker-Poole Bayesian Multidimensional Scaling Software and Examples
R Package for Aldrich-McKelvey and Basic Space Scaling
R Package for Optimal Classification
R Package for W-NOMINATE (includes the parametric bootstrap option)
DW-NOMINATE Program with Examples (Under Construction, 6 January 2016
Software for Evaluating Dimensionality in Spatial Voting Models (Under Construction, 25 March 2016)

Miscellaneous Information From the Roll Call Project Database

Percent Voting on the Winning Side by Member -- Houses/Senates 1 - 113
Corrected ICPSR Member ID Numbers Congresses 1 - 113
Republican and Democratic Party Splits on all roll calls cast in Congresses 35 - 113
Pary Unity Scores by Party: 1789 - 2014
Party Unity Scores by Member: 1789 - 2014
Political Polarization Measures: 1879 - 2014
Party and Chamber Medians, 1 - 113 Congresses (DW-NOMINATE Scores)
Chamber Means and Winning Policy Means for 1^st Dimension, 1 - 113 Congresses (DW-NOMINATE Scores)
DW-NOMINATE Scores for Congressional Leaders: 1789 - 2000

Roll Call Data

All the roll call matrices and codebooks listed in the links below are in a common format. Questions about the layout of these data should be directed to Keith Poole (ktpoole@uga.edu).
Roll Call Matrices and codebooks for Congresses 109 - 113 were compiled by Jeff Lewis and Keith Poole.
113th House Roll Call Data
113th Senate Roll Call Data
112th House Roll Call Data
112th Senate Roll Call Data
111th House Roll Call Data
111th Senate Roll Call Data
110th House Roll Call Data
110th Senate Roll Call Data
109th House Roll Call Data
109th Senate Roll Call Data
Roll Call Matrices and codebooks for Congresses 102 - 108 were compiled by Keith Poole and Nolan McCarty.
108th House Roll Call Data
108th Senate Roll Call Data
107th House Roll Call Data
107th Senate Roll Call Data
106th House Roll Call Data
106th Senate Roll Call Data
105th House Roll Call Data
105th Senate Roll Call Data
104th House Roll Call Data
104th Senate Roll Call Data
103rd House Roll Call Data
103rd Senate Roll Call Data
102nd House Roll Call Data
102nd Senate Roll Call Data

Roll Call matrices and codebooks for Congresses 1 - 101 were originally compiled by the ICPSR. The versions posted on the pages below are heavily revised from the 1980s originals. The roll call matrices have been reformatted and extensively cleaned and many of the party and ID codes have been corrected. The codebooks have been transformed so that they are fixed-format ASCII files in a standardized format. Questions about the layout of and the corrections made to these data should be directed to Keith Poole (ktpoole@uga.edu).
101st House Roll Call Data
101st Senate Roll Call Data
100th House Roll Call Data
100th Senate Roll Call Data
99th House Roll Call Data
99th Senate Roll Call Data
98th House Roll Call Data
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3rd House Roll Call Data
3rd Senate Roll Call Data
2nd House Roll Call Data
2nd Senate Roll Call Data
1st House Roll Call Data
1st Senate Roll Call Data

General Data Collections

STATA files for the American National Election Studies 1952-2008
Interest Group Ratings (1959 - 1981)
Data Used in October 1996 World Politics Article
Data for Friends

Movies and Animated Gifs

Two Dimensional Movie of the 1^st to 113^th Houses and Senates (high resolution, 468 Megabytes!!)

Site Links