In this paper, we present an analysis of the measurement characteristics of five congressional roll-call indexes. Our analysis is based on a 1987 survey of members of the U.S. House of Representatives and the scores those representatives received on the following indexes: the Americans for Democratic Action index, the Conservative Coalition score and the three National Journal ratings. With these data, we examine the reliability and the validity of the roll-call indexes. We find the ADA and Conservative Coalition indexes to be valid measures of ideology. There are questions about the validity of the National Journal ratings. All the indexes were highly reliable.
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Smith et al. (1990) studied this question.
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