The Perils of Cherry Picking Low Frequency Events in Large Sample Surveys

November 5, 2014

Stephen Ansolabehere (Harvard University, PI CCES)
Samantha Luks (YouGov)
Brian F. Schaffner (University of Massachusetts, Amherst, co-­PI CCES)

The advent of large sample surveys, such as the Cooperative Congressional Election Study (CCES), has opened the possibility of measuring very low frequency events, characteristics, and behaviors in the population. This is certainly a worthy objective, but researchers must use caution when studying low probability events and behaviors, such as non-citizenship rates and voting. Even very low-level...

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Announcing the 2014 Cooperative Congressional Election Study

February 25, 2014

There is power in numbers. Starting in 2006, a consortium of 39 universities came together to create the Cooperative Congressional Election Study, the first truly large-scale academic survey project aimed at studying the midterm Congressional elections. The study has continued every year thereafter, and continues to involve teams of researchers from across the country. Our joint efforts have produced national sample surveys in every federal election since, including 55,000 person samples in 2010 and 2012. Professor Stephen Ansolabehere of Harvard University coordinates the CCES and the...

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2013 Sundance Conference Is Open for Registration

December 10, 2012
The next CCES Sundance Conference, hosted by the Center for the Study of Elections and Democracy at Brigham Young University, will be held at the Sundance Resort near Provo, UT, from May 23–25.

If you would like to attend the conference, please visit for registration and room reservation instructions. The registration fee is $300. After you register, the conference team will contact you directly to work out transportation arrangements and dietary concerns... Read more about 2013 Sundance Conference Is Open for Registration

New Data Source on Congressional Elections

September 22, 2011

The 2006 UC Davis “district expert survey” has been released for general use by the scholarly community.  The district expert survey was conducted in a random sample of 100 U.S. House districts in 2006, and in a supplemental sample of 55 districts chosen because they were expected to be open and/or competitive.  National convention delegates and state legislators in both political parties were surveyed by mail as district expert informants in October of 2006.  The size of these district panels varied by district but averaged just over 6 per district.  


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Used the CCES in your work? Let us know!

August 12, 2011

If you've created written work (journal articles, conference papers, theses, working papers) using the CCES data, please let us know!  We'll post citations of your work on the site, ensuring that you receive credit for the work you've done and allowing other researchers to track articles of interest.

Come See Us at APSA 2011

August 3, 2011

There will be a CCES group meeting happening at APSA 2011:

Date: Friday, September 2

Time: 6:15-7:15pm

Room: Grand Hyatt Seattle, Sherman Room

The 2011 CCES conference was a success!

May 26, 2011

Thanks to everyone who came and made this such a great event!  The wide variety of presentations and topics covered at the conference showed what a dynamic team of researchers participate in the CCES.  It will exciting to see how the study continues to develop into 2011 and 2012.

(Attendees also got a chance to enjoy the outdoors!-- Stephen Ansolabehere and Alex Theodoridis pictured below)