The committee outlier debate: A review and a reexamination of some of the evidence

An ongoing and controversial topic of congressional scholars is the question “Are committees ‘preference outliers’ vis-a-vis their parent chamber?” Despite numerous research efforts showing isolated cases of outlying committees, little evidence shows a systematic tendency for committees to be unrepresentative of their legislature. A paper which comes close to being an exception is Weingast and Marshall's (1988) analysis of “the industrial organization of Congress,” which reports evidence of many and very strongly outlying committees. However, the apparently strong evidence is due more to the authors' incorrectly executed methods than to a general tendency for committees to be outliers. In this note I review the state of the committee-outlier debate and also show that Weingast and Marshall's empirical results cannot be replicated. I accordingly provide the correct results once their statistical tests are properly executed.