Ok, if the 111 were part of random 1400, just tested 1st, then I withdraw my comment. Seemed like they were separate self-selected pop 
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En réponse à @PistolPeteski
I went back and reread it, I was slightly mistaken as well (though in a way I think still fits). The other 1300 they were
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En réponse à @ChrisWarcraft @PistolPeteski
referencing were football players who have died since the study started. So we know 110 for sure out of 1400ish.
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En réponse à @ChrisWarcraft @PistolPeteski
Ideally, they'd be able to test those brains as well to get the actual numbers. I suspect it's around 15-20%
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En réponse à @ChrisWarcraft @PistolPeteski
Point still remains that it's the same population though (football players who have died), so it's fair to compare.
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En réponse à @ChrisWarcraft
Compare away, but 9% isn't statistically valid (& concl that 5% is "stat sig diff" is unsupported) if 111 aren't part of a random sample
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En réponse à @PistolPeteski
The entire sample is 1400. 110 so far have shown signs. Even if no other brains showed signs, that's still 9%
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En réponse à @ChrisWarcraft @PistolPeteski
Random sampling would in no way make that number less
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En réponse à @ChrisWarcraft
And yes, random sampling could make it less IF the 1400 were self selected (for example, only ppl w symptoms in life sent their brains in)
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En réponse à @PistolPeteski
the 1400 aren't self selected. 1400 football players have died since the study started. 111 sent their brains in. 110 had CTE
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no matter what, 9% is the lowest bound of players with CTE, and it's likely it's much higher.
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En réponse à @ChrisWarcraft
You can't draw that conclusion. Even the investigators say they can't.
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