How does one go about that? I assume you have to have certain information & I wonder how we would figure out what that all would be without leaving anything out....ok, I am asking you mathematicians here & I am not one. Thank you.
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That's generally the idea behind polls, but if the polls are close or changing a lot, they don't tell you much until you get close to the elections.
Other than polls? No.
Other than polls? No.
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No, because even after polls are taken, people are still changing their votes due to campaigns, dropouts and other factors. There is no (accurate) mathematical model for elections.