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1. DW-NOMINATE

   Common Space DW-NOMINATE Scores 1^st to 110^th Congresses
   
   DW-NOMINATE Scores 1^st to 110^th Congresses
   
   Political Polarization Measures: 1879 - 2006
   
   Party Unity Scores by Democrat and Republican Members: 1857 - 2006
   
   Pary Unity Scores by Congress: 1879 - 2006
   
   Party and Chamber Medians, 1 - 109 Congresses (DW-NOMINATE Scores)
   
   Chamber Means and Winning Policy Means for 1^st Dimension, 1 - 109 Congresses (DW-NOMINATE Scores)
   
   Republican and Democratic Party Splits on all roll calls cast in Congresses 35 - 109
   
   DW-NOMINATE Roll Call Coordinates and Issue Codes for Houses 1 to 106
   
   DW-NOMINATE Roll Call Coordinates and Issue Codes for Senates 1 to 106
   
   DW-NOMINATE Scores for Congressional Leaders: 1789 - 2000
   
   House and Senate Images of DW-NOMINATE Scores 70^th to 107^th Congresses
   
   The 106^th Congress Page shows statistics on the scalings and compares the results for the 106^th Congress with the 105^th and 104^th Congresses
   
   The 105^th Congress Page shows statistics on the scalings and compares the results for the 105^th Congress with the 104^th Congress
   
   106^th House: Two Dimensional Images For each Roll Call By Issue Code
   
   DW-NOMINATE Program
   
   

2. W-NOMINATE

   W-NOMINATE Scores With Bootstrapped Standard Errors
   
   W-NOMINATE Program
   
   W-NOMINATE Parametric Bootstrap Program
   
   W-NOMINATE scores by year for 1939 - 1998
   
   
   
   
   

3. Optimal Classification (OC)

   Optimal Classification Scores: Houses/Senates 1 - 109 in a Common Space
   
   Optimal Classification (OC) Program
   
   
   
   
   

4. Common Space Scores

   Common Space Scores 75^th to 109^th Congresses
   
   
   Format of the Common Space Scores
   
   
   House and Senate Images of Common Space Scores 75^th to 107^th Congresses
   
   
   
   
   

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
   
   

Corrected ICPSR Member ID Numbers Congresses 1 - 107

Republican and Democratic Party Splits on all roll calls cast in Congresses 35 - 109

Pary Unity Scores by Party: 1789 - 2006

Party Unity Scores by Member: 1789 - 2006

Political Polarization Measures: 1879 - 2006

Party and Chamber Medians, 1 - 109 Congresses (DW-NOMINATE Scores)

Chamber Means and Winning Policy Means for 1^st Dimension, 1 - 109 Congresses (DW-NOMINATE Scores)

DW-NOMINATE Scores for Congressional Leaders: 1789 - 2000

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 (KPoole@ucsd.edu).

Roll Call Matrices and codebooks for Congresses 109 - 110 were compiled by Jeff Lewis and Keith Poole.

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 (KPoole@ucsd.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
98th Senate Roll Call Data
97th House Roll Call Data
97th Senate Roll Call Data
96th House Roll Call Data
96th Senate Roll Call Data
95th House Roll Call Data
95th Senate Roll Call Data
94th House Roll Call Data
94th Senate Roll Call Data
93rd House Roll Call Data
93rd Senate Roll Call Data
92nd House Roll Call Data
92nd Senate Roll Call Data
91st House Roll Call Data
91st Senate Roll Call Data
90th House Roll Call Data
90th Senate Roll Call Data
89th House Roll Call Data
89th Senate Roll Call Data
88th House Roll Call Data
88th Senate Roll Call Data
87th House Roll Call Data
87th Senate Roll Call Data
86th House Roll Call Data
86th Senate Roll Call Data
85th House Roll Call Data
85th Senate Roll Call Data
84th House Roll Call Data
84th Senate Roll Call Data
83rd House Roll Call Data
83rd Senate Roll Call Data
82nd House Roll Call Data
82nd Senate Roll Call Data
81st House Roll Call Data
81st Senate Roll Call Data
80th House Roll Call Data
80th Senate Roll Call Data
79th House Roll Call Data
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78th House Roll Call Data
78th Senate Roll Call Data
77th House Roll Call Data
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76th House Roll Call Data
76th Senate Roll Call Data
75th House Roll Call Data
75th Senate Roll Call Data
74th House Roll Call Data
74th Senate Roll Call Data
73rd House Roll Call Data
73rd Senate Roll Call Data
72nd House Roll Call Data
72nd Senate Roll Call Data
71st House Roll Call Data
71st Senate Roll Call Data
70th House Roll Call Data
70th Senate Roll Call Data
69th House Roll Call Data
69th Senate Roll Call Data
68th House Roll Call Data
68th Senate Roll Call Data
67th House Roll Call Data
67th Senate Roll Call Data
66th House Roll Call Data
66th Senate Roll Call Data
65th House Roll Call Data
65th Senate Roll Call Data
64th House Roll Call Data
64th Senate Roll Call Data
63rd House Roll Call Data
63rd Senate Roll Call Data
62nd House Roll Call Data
62nd Senate Roll Call Data
61st House Roll Call Data
61st Senate Roll Call Data
60th House Roll Call Data
60th Senate Roll Call Data
59th House Roll Call Data
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58th House Roll Call Data
58th Senate Roll Call Data
57th House Roll Call Data
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56th House Roll Call Data
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53rd House Roll Call Data
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52nd House Roll Call Data
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51st House Roll Call Data
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50th House Roll Call Data
50th Senate Roll Call Data
49th House Roll Call Data
49th Senate Roll Call Data
48th House Roll Call Data
48th Senate Roll Call Data
47th House Roll Call Data
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46th House Roll Call Data
46th Senate Roll Call Data
45th House Roll Call Data
45th Senate Roll Call Data
44th House Roll Call Data
44th Senate Roll Call Data
43rd House Roll Call Data
43rd Senate Roll Call Data
42nd House Roll Call Data
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41st House Roll Call Data
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40th House Roll Call Data
40th Senate Roll Call Data
39th House Roll Call Data
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38th House Roll Call Data
38th Senate Roll Call Data
37th House Roll Call Data
37th Senate Roll Call Data
36th House Roll Call Data
36th Senate Roll Call Data
35th House Roll Call Data
35th Senate Roll Call Data
34th House Roll Call Data
34th Senate Roll Call Data
33rd House Roll Call Data
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32nd House Roll Call Data
32nd Senate Roll Call Data
31st House Roll Call Data
31st Senate Roll Call Data
30th House Roll Call Data
30th Senate Roll Call Data
29th House Roll Call Data
29th Senate Roll Call Data
28th House Roll Call Data
28th Senate Roll Call Data
27th House Roll Call Data
27th Senate Roll Call Data
26th House Roll Call Data
26th Senate Roll Call Data
25th House Roll Call Data
25th Senate Roll Call Data
24th House Roll Call Data
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23rd House Roll Call Data
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22nd House Roll Call Data
22nd Senate Roll Call Data
21st House Roll Call Data
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20th House Roll Call Data
20th Senate Roll Call Data
19th House Roll Call Data
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18th House Roll Call Data
18th Senate Roll Call Data
17th House Roll Call Data
17th Senate Roll Call Data
16th House Roll Call Data
16th Senate Roll Call Data
15th House Roll Call Data
15th Senate Roll Call Data
14th House Roll Call Data
14th Senate Roll Call Data
13th House Roll Call Data
13th Senate Roll Call Data
12th House Roll Call Data
12th Senate Roll Call Data
11th House Roll Call Data
11th Senate Roll Call Data
10th House Roll Call Data
10th Senate Roll Call Data
9th House Roll Call Data
9th Senate Roll Call Data
8th House Roll Call Data
8th Senate Roll Call Data
7th House Roll Call Data
7th Senate Roll Call Data
6th House Roll Call Data
6th Senate Roll Call Data
5th House Roll Call Data
5th Senate Roll Call Data
4th House Roll Call Data
4th Senate Roll Call Data
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

Non-USA Roll Call Matrices in the *.ORD Format

Interest Group Ratings (1959 - 1981)

Data Used in October 1996 World Politics Article

Data For Friends

VOTEVIEW for WINDOWS

W-NOMINATE Program

W-NOMINATE Parametric Bootstrap Program

Optimal Classification (OC) Program

Quadratic-Normal (QN) Program

Richard McKelvey's original N-Chotomous Multivariate Probit Program

Aldrich-McKelvey's Scaling Program

Two Dimensional Movie of the 1^st to 110^th Houses and Senates (high resolution, 547 Megabytes!!)

Two Dimensional Movie of the 1^st to 109^th Houses and Senates (high resolution, 718 Megabytes!!)

Two Dimensional Movie of the 1^st to 107^th Houses and Senates (215 Megabytes!!)

Two Dimensional Animated Gif for the 1^st to 107^th Houses and Senates (DW-NOMINATE)

Two Dimensional Animated Gif for the 75^th to 107^th Houses and Senates (Common Space Scores)

One Dimensional Animated Gif for the 46^th to 105^th Houses

Two Dimensional Animated Gif for the 46^th to 105^th Houses

Two Dimensional Animated Gif for the 46^th to 105^th Congresses (House and Senate Simultaneously)

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