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I see this repeated all the time and I don't understand how people come to this conclusion. 538 consistently gave Trump a better chance than much of the mainst
by cthalupa 3y ago
I see this repeated all the time and I don't understand how people come to this conclusion.
538 consistently gave Trump a better chance than much of the mainstream media, with him showing a roughly 30% chance for much of the year, including right up at the election. At times it dropped as low as 15% or so, but... that's still not some insanely rare occurrence.
As for what they were actually saying? Silver and 538 never claimed it was a sure thing. Let's look at some actual articles:
https://fivethirtyeight.com/features/election-update-dont-ignore-the-polls-clinton-leads-but-its-a-close-race/ https://fivethirtyeight.com/features/election-update-dont-ig...
"At the same time, it shouldn’t be hard to see how Clinton could lose. She’s up by about 3 percentage points nationally, and 3-point polling errors happen fairly often, including in the last two federal elections. Obama beat his polls by about 3 points in 2012, whereas Republicans beat their polls by 3 to 4 points in the 2014 midterms. If such an error were to favor Clinton, she could win in a borderline landslide. If the error favored Trump, however, she’d be in a dicey position, because the error is highly correlated across states.
There’s also reason to think a polling error is more likely than usual this year, because of the high number of undecided voters. In national polls, Clinton averages about 45 percent of the vote and Trump 42 percent; by comparison, Obama led Mitt Romney roughly 49-48 in national polls at the end of the 2012 campaign. That contributes significantly to uncertainty, since neither candidate has enough votes yet to have the election in the bag.
To be honest, I’m kind of confused as to why people think it’s heretical for our model to give Trump a 1-in-3 chance — which does make him a fairly significant underdog, after all. There are a lot of ways to build models, and there are lots of factors that a model based on public polling, like ours, doesn’t consider.3 But the public polls — specifically including the highest-quality public polls — show a tight race in which turnout and late-deciding voters will determine the difference between a clear Clinton win, a narrow Clinton win and Trump finding his way to 270 electoral votes."
https://fivethirtyeight.com/features/clinton-probably-finished-off-trump-last-night/ https://fivethirtyeight.com/features/clinton-probably-finish... is about as bullish on Clinton as I can find from the archives, and even there Silver does not talk about how Hillary is a sure thing, and instead spend several paragraphs discussing reasons why Trump could still win and what those would look like. And as those things occurred, the model shifted back from being as bullish on Hillary, for the reasons Silver outlines.
I don't know why you would read a 70% chance of victory as being the same thing as a sure victory. I wouldn't want to bet my life on a 70% success rate!
- XorNot 3y agoCommon problem with % statistics I find is they dissuade people from considering the actual occurrences of something. 70% chance of success is about a 1 out of 3 chance of failure.