"Political Analysis" is an annual publication sponsored by the methodology section of the American Political Science Association. Now in its fifth year, the annual publishes scholarly articles on topics related to all areas of political science methodology, broadly defined. Methodology includes research design, measurement and measurement theory, estimation, statistical inference, simulation, mathematical modeling and other topics. This volume joins its predecessors as a publication of great value in disseminating new methodological research.John R. Freeman is Professor of Political Science, University of Minnesota.