Institution for Social and Policy Studies

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Party Affiliation, Partisanship, and Political Beliefs: A Field Experiment

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Alan S. Gerber, Gregory A. Huber, Ebonya Washington

Research design: 
Data type: 
Data source(s): 

Authors; Connecticut voter file

Field date: 
June 1, 2008
Location details: 
United States - CT
Unit of observation: 
Sample size: 
Our initial sampling frame was all registered, but formally unaffiliated, voters listed in the Connecticut voter file. We eliminated from this list all records where telephone or address records were invalid or inconsistent. We also removed records where the address or telephone number appeared three or more times in the voter file to make it easier to target specific individuals and to avoid temporary housing where respondents were more likely to have moved. We focused our sample on voters we believed to be more amenable to partisan conversion: Those who were younger (18–49, inclusive) and had recently participated (who voted in any election in 2006, 2004, or 2002 or were less than 21 and had registered after 2000).
Randomization procedure: 
We sent a treatment letter to a 50% random subset of the experimental participants (A test of random assignment appears in Table A1 in the online Appendix, in which we demonstrate that observable features of respondents in the treatment and control groups cannot explain treatment assignment).
We mailed letters on January 22, 2008 that reminded the recipient of the upcoming election and explained the need to affiliate with a party in order to participate in the party's presidential primary... the letter provides voters with information about their registration status, the upcoming primary, and the need to register with a party to participate in the primary.
Treatment administration: 
Outcome measures: 
Party identification, party registration, turnout, political attitudes
Archive date: 
Archive contributor: 
Limor Peer
Owner contact: 


Terms of use: 

Academic, non-commercial; see ISPS Terms of Use /data/data/login/isps-data-archive/

Area of study: 
Data file numbersort descending Description File format Size File url
D055F01 ReadMe file .txt 1024 Download file
D055F02 Dataset Stata (10.0) .dta 601088 Download file
D055F03 Dataset Excel .csv 581632 Download file
D055F04 Program file - anonymize Stata (10.0) .do 8601 Download file
D055F05 Program file - main Stata (10.0) .do 45465 Download file
D055F06 Program file - main R (2.9.1) 17408 Download file
D055F07 Treatment material Adobe acrobat (8.0) .pdf 93081 Download file
D055F08 Supplementary material - pretreatment ID Adobe acrobat (8.0) .pdf 169881 Download file
D055F09 Supplementary material - appendix Adobe acrobat (8.0) .pdf 519475 Download file
D055F10 Codebook XML (1.1) .xml 68812 Download file
D055F11 Metadata record Adobe acrobat (8.0) .pdf 68812 Download file