Nobody knows who the hell is gonna win the election, and if they say they're 93.8% sure, don't believe them.https://twitter.com/FiveThirtyEight/status/1224157228233625600 …
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Replying to @ezralevin @Biggan4Congress
If a model says 93.8%, believe it. Just don't act like it's 100%. 93.8% isn't 100%
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Don't believe it, because the model probability is not a measuring what it claims to measure.
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Replying to @BioTurboNick @ImaQzak and
The model isn't giving a probability of this team winning now. It's giving the fraction of times past teams would have won in similar situations, given the parameters used.
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Replying to @BioTurboNick @ImaQzak and
That is, it's more a historical comparison than a prediction.
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It's presented as a prediction - and a high probability prediction at that. A hard precise number for the "chance to win" with a fancy-sounding model behind it, and a conclusion that the other team will "need magic" to win. If that's not a prediction, what is it?
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The problem with models like this are that they are so easily misunderstood. Most people assume that a prediction like this makes it a sure thing. Like Nick said, this is essentially saying that, assuming everything works the way it has in the past, 93.8% of the time the 49rs win
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Replying to @Biggan4Congress @ezralevin and
The best and easiest assumption is that not everything will work like it has worked in the past which makes all these predictions no better than witchcraft.
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Replying to @muhozag @ezralevin and
If they’re used correctly they have some value, but the way they typically get used, especially by the media and pundits, can make them harmful.
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Replying to @Biggan4Congress @ezralevin and
In the case of elections. . .I have always wondered, what would be an example of using these models correctly? How can they be of value for voters and democracy in general?
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That’s a fair question. For elections, I’m not sure there is a correct way of using them. Outside of elections, there is value. I have used them in healthcare and foster care to improve the system.
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Replying to @Biggan4Congress @ezralevin and
My problem with them is that when they predict "correctly" they seem to claim victory as if they are so precise and not probabilistic, but when they do not then everyone else does not understand probability. I just feel that they mislead with their language & endless publications
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Replying to @muhozag @Biggan4Congress and
I remember 2 things in probability: aleatory and epistemic uncertainity. The latter is why I take 538 as just entertainment especially when it comes to elections. I see nothing of value in their predictions. Maybe even negative value for voters who take their numbers as-is
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