Analysis of the spatial pattern of voting at elections, of the changing pattern between two elections, and of the correlates of these patterns (usually involving ecological assumptions) has traditionally involved using a percentaged statistic as the dependent variable. Thus, for example, attempts to account for the distribution of the Labour vote in Great Britain may use the percentage of 1) the electorate, 2) those who voted, or 3) those who voted for the two (Conservative and Labour) parties as the dependent variable in a series of ecological regressions (as in Miller, 1977). In countries such as Great Britain and the United States the dominance of two parties has meant that such analyses are relatively comprehensive. An analysis of the ecological correlates of percentage voting Democrat in the United States, for example, has as its complement an implicit analysis of the percentage voting Republican. Such inductions, however, are not readily made in multi-party situations.