Common Space Data
6 January 2015
Common Space Scores Congresses 75 - 113Common Space Scores (Text File)
Common Space Scores (Excel File)
Common Space Scores (Stata 13 File)
Common Space Scores (Stata 12 File)
BL75113.DAT are W-NOMINATE coordinates for the 75th through the 113th (2014) Houses and Senates adjusted so that the the House and Senate members and the
Presidents are in the same space. There is one record for each legislator and each
Congress for this time period (n=21,144, 1937-2014).
The format for BL75113.DAT is:
1. Congress Number 75 - 113
2. ICPSR ID Number: 5 digit code assigned by the ICPSR as
corrected by Howard Rosenthal and myself.
3. State Code: 2 digit ICPSR State Code (99 if President)
4. Congress District Number (Senate and President = 0)
5. Name of State
6. Party Code: 100 = Dem., 200 = Repub. (See party3.html)
8. 1st Dimension Coordinate
9. 2nd Dimension Coordinate
10. Indicator For Chamber
0 = House
1 = Senate
2 = President (83 - 113)
The W-NOMINATE coordinates of all members serving in both the House and Senate from
1937 - 2014 (Congresses 75 - 113) were used to estimate the common space coordinates.
Each legislator is assigned a single coordinate throughout his or her career so that
members who served in both chambers will have the same coordinate in both. The 1st
dimension coordinates correlate with the corresponding DW-NOMINATE coordinates at
.95 or higher for all Houses and Senates. All Houses and Senates after the 80th Congress
correlate at .96 and higher for both dimensions.
The Presidents from Eisenhower through Clinton were scaled using the CQ Presidential
Support Roll Calls in W-NOMINATE. See "Veto Power and Legislation: An Empirical Analysis
of Executive and Legislative Bargaining from 1961-1986," Journal of Law, Economics, and Organization, 11, 1995, 282-312 (with Nolan M. McCarty), for an analysis of these W-NOMINATE scores.
Their W-NOMINATE scores were treated like any other member of the House and Senate
for the purposes of fitting them into the common space.
Note that the common space coordinates are adjusted so that the two dimensions are
equally salient and lie within a unit circle. The first dimension W-NOMINATE and DW-NOMINATE scores correctly classify about 85
percent of roll call choices through this period and the second dimension typically
picks up an additional 2 to 5 percent.
The state, congressional district, and party codes used in the common space coordinate
file correspond to Ken Martis's The Historical Atlas of Political Parties in the United States Congress. Howard and I consider Martis's Atlas to be the best source of information about
party affiliation of members of Congress so that our data base can be considered to
be very "clean". Congresses 1 - 100 have been extensively checked by ourselves and
other scholars. Congresses 101-113 have also been checked but cannot be considered
to be completely "clean". If you find errors, please send E-Mail to Keith Poole --
email@example.com -- so that corrections can be made.
The file party3.html contains the dictionary for the party codes. Please cite Ken Martis's atlas as the
original source if you use these codes in any way.
NOMINATE Data, Roll Call Data, and Software
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