06/03/2022
https://www.facebook.com/100050427672319/posts/517893506568234/
Iâve seen some variation of this rant a few times:
âI survived lead paint, wooden spoons, no seatbelts, no helmets, second hand smoke, playing unsupervised, drinking from the hose, and riding in the back of a truck.â
This âyou kids that I raised are soft and itâs all your faultâ nostalgia misses something in the quest to make asbestos great again; a lot of people didnât survive this f**kery.
Todayâs Moment of Science⊠Survivorship bias & phantom bullet holes.
We like to think that weâre rational thinkers, able to spot logical fallacies out in the wilderness. But what happens when the cause of your logical fallacy is information thatâs long gone? This is a kind of selection bias known as survivorship bias, and itâs annoyingly common.
âOld houses were better constructed.â Or you only see the sturdiest of the old ones today because nobody made an effort to save the 14th century shacks.
âMusic from back in the day is standing the test of time.â Thereâs caterwauling that deserves its fate in the bowels of music history from every era, Iâm afraid.
âYou can become a billionaire without going to college if you just work hard and read books, look at this tech bro who I think is irl Tony Stark.â
Truly, I enjoy an inspiring story about not having student loan debt as much as the next millennial going through an existential crisis. But every story of someone who got rich or famous tells the quieter story of far more people who wanted it just as badly, tried, and failed.
So, airplanes.
Abraham Wald was a Hungarian Jew who fled Europe for the US in the late 1930s because of that whole âHitler was a murderous cockfaceâ thing. He had his PhD in mathematics and went to work for the Statistical Research Group (SRG) at Columbia University. The SRG has been described as a collection of the âmost extraordinary group of statisticians ever organized.â
Planes kept coming back from the war with bullet holes in a certain pattern, if they came back at all. Damage clustered around the wing tips and tail. Weight needed to be kept low while giving the plane more protection, and the areas that had sustained a lot of fire seemed like the obvious places to armor up. Right?
But Wald suggested that planes were likely to be hit fairly evenly, not that the enemy fire was clustering around these spots tactically. He considered the data he didnât have: the planes that never came home. Where were they being hit?
If he was right that planes took fire everywhere, then the planes should be armored heavily where the surviving planes hadnât taken damage. The engine and the cockpit came back seemingly unscathed every time in otherwise bullet ridden planes. Those areas were subsequently fortified.
Itâs a good lesson in survivorship bias. And saved untold lives.
Abraham Waldâs work contributed considerably to the burgeoning field of operational research. Because of his immigration status, he reportedly wasnât able to get a security clearance or even look at the final reports he contributed to. He died in a plane crash in 1950 on the way to India for a lecture tour at just 48 years old.
This has been your Moment of Science, never sure I have all the data.
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