Simpson's Paradox
· ☕ 339 words statistics · ✍️ Peter Hiltz
I was recently re-introduced to Simpson’s Paradox in statistics - how aggregation can mislead.
(I’m just making up the numbers here to demonstrate the concept.) Suppose you have China with an overall illness survival rate of 95% and Italy with an overall illness survival rate of 85%. On the face of it, that looks like China does a better job of taking care of patients than Italy.
But now suppose you look at the survival rate by age group and Italy has a higher illness survival rate in every single age bracket.