The Stability of Congressional Roll-Call Indexes

Richard Herrera, Thomas Epperlein, Eric R A N Smith

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


This study builds on previous work that has shown congressional roll-call indexes to be both reliable and valid indicators of House members' ideolo gy. Using a longitudinal set of data comprised of Americans for Democratic Action (ADA) ratings, Americans for Conservative Action (ACA) scores, Congressional Quarterly's Conservative Coalition (CC) ratings and Nation al Journal's (NJ) scores, we examine the stability of the indexes using a con firmatory factor model. The results confirm the high level of validity and reliability found previously and provide evidence of an equally high level of stability. Congressional roll-call indexes, though based on a sampling of votes taken in the House of Representatives, perform quite well with regard to these three measurement characteristics.

Original languageEnglish (US)
Pages (from-to)403-416
Number of pages14
JournalPolitical Research Quarterly
Issue number2
StatePublished - Jun 1995

ASJC Scopus subject areas

  • Sociology and Political Science


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