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Abstract This Note introduces the Heads of Government dataset, which provides summary information about the ideological orientation of heads of government (left, center, or right, with separately provided information about religious orientation) in 33 states in Western Europe, the Americas, and the Asia–Pacific region between 1870 and 2012. The Note also describes some intriguing empirical patterns when it comes to over-time changes in the political prominence of left-wing, centrist, and right-wing parties.
Brambor et al. (Mon,) studied this question.