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PTR!

Use this operator to create a Republican partisan control variable from a vote proportion. For example, if vote88 is the Democratic proportion of the two-party vote, PTD!vote88 is $-1$ if the Republican candidate wins the district (vote88$<$0.5) and 0 if the Democratic candidate wins (vote88$>$0.5). This is useful for commands such as PROB so that one can calculate the expected proportion of districts where, for example, previous Republican winners are likely to win again.