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3 tweets,
2 min read
Read on Twitter
1/ “During WWII, Navy tried to determine where they needed armor in planes. They ran an analysis of where planes had been shot up, and came up with this. The places that needed to be up-armored are wingtips, central body, and elevators. That’s where the planes were getting shot 
2/ Wald (statistician) disagreed. He thought they should armor nose, engines, mid-body, which was crazy, of course. That’s not where the planes were getting shot. Except Mr. Wald realized what the others didn’t. The planes were getting shot there too, but weren’t making it home.
3/ The Navy thought it was analyzing where aircraft were suffering most. What they did was analyze where aircraft could suffer the most damage without catastrophic failure. All of the places that weren’t hit? They weren’t looking at the whole sample set, only the survivors”
