Misusing Probability
Nate Silver has been getting some flack for his declaration that Donald Trump had a 2% chance of winning the GOP nomination. One thing to note in Silver's defense: "2% chance" is not "no chance": 2% chance events happen! But the real problem is elsewhere: Silver thinks we can assign "objective" probabilities to one-off events. But to assign a probability to any potential happening in an "objective" way, we have to abstract from the particular circumstances of time and place absolutely everything that cannot be reduced to a number by which we can "objectively" place that potential happening into a class with other, past happenings taken to be "identical" to the potential happening in all relevant features except those differing numbers. (For instance, we will have to turn each presidential candidate into a point in a vector space, where the number of "factors" we choose to include in our analysis are the dimen...