“…Over the last decade a relatively sizable body of research has been generated on this question (see, e.g. van Arnhem and Schotsman, 1982;Borg and Castles, 1981;Dryzek, 1978;Hewitt, 1977;Hicks and Swank, 1984b;Jackman, 1980b;Katz, Mahler, and Franz, 1983;Stack, 1979;Stephens, 1979). However, because reasonably reliable and comparable data have been available for only a subset of approximately one-half to two-thirds of the population, empirical tests of hypotheses often have been confined to bivariate correlations, which are inconclusive.…”