Here are five ways you can have correlation without causation: 1. Averaging: increasing A sometimes causes increasing B, but other times, it causes B to decrease. The two balance out. Since correlation measures the average relationship, the correlation is zero. For example, if you drive up a symmetrical hill and then down the other side, there’s no correlation between how many times the wheels have revolved on the hill and the car’s height above sea level, even though the revolving of the...