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In their article ‘Constituency Characteristics, Individual Characteristics and Tactical Voting in the 1987 British General Election’, Niemi, Whitten and Franklin claim that in the 1987 general election ‘about one in every six voters … had tactical considerations in mind in deciding whom to vote for’. As they point out, this figure is far higher than Heath et al. 's estimate of 6.5 per cent of major party voters having ‘a tactical motivation for their vote’. It is also far higher than estimates obtained by other analyses of the 1987 election using aggregate data. In this Note we point to methodological weaknesses in Niemi, Whitten and Franklin's article which indicate that their estimate is unlikely to be a valid measure of tactical voting, at least of the concept as customarily understood by political scientists. Indeed, when looked at carefully, the evidence they present to support their expanded estimate of tactical voting serves only to re-affirm the original claims of Heath and his colleagues and the other conservative estimates of the prevalence of tactical voting.
Evans et al. (Fri,) studied this question.