Abstract
We apply a dynamic spatial model to interest group ratings of the members of Congress over the period 1959–1981. Spatial distances between an interest group and the members of Congress are assumed to be monotonic with the ratings. Our pooled cross-sectional time-series data set consists of 203,387 ratings by 59 interest groups. We restrict the spatial coordinates of the interest groups and members of Congress to be polynomial functions of time. Two significant dimensions are recovered: the first dimension, which accounts for approximately 75% of the variance, represents liberal-conservative positions on economic issues; the second dimension, which accounts for approximately an additional 5% of the variance, represents liberal-conservative positions on social issues. Nearly all the interest groups and most members of Congress are ideologically consistent. They are either liberal on both dimensions or conservative on both.
This work was supported by a grant from the National Science Foundation. An earlier version of this paper was presented at the “Information and Politics Conference”, Austin, Texas, 13–15 February 1986. Minor differences in results between this paper and the earlier version reflect the addition of the 1981 data and improvements to the algorithm used for the two- and three-dimensional scalings.
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Poole, K.T., Rosenthal, H. (1998). The dynamics of interest group evaluations of Congress. In: Hinich, M.J., Munger, M.C. (eds) Empirical Studies in Comparative Politics. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-5127-7_5
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DOI: https://doi.org/10.1007/978-1-4757-5127-7_5
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