As of this morning, ABC’s Project FiveThirtyEight says that Donald Trump wins 53 times out of 100 and Kamala Harris wins 47 times out of 100. How can we make sense of this statement?To do so, we have to understand the difference between case probability and class probability.Presidential elections are unique events that are determined by the actions of humans, and so belong to the case probability category. The nature of such events is that numerical probabilities cannot be assigned in a scientific way to the possible outcomes. All we can do is guess, based on our own judgment of the circumstances and how we think the people who participate in determining the outcome will act. But this guess is a qualitative judgment and can only be articulated with numbers by recourse to metaphorical
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