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If you’re treating a forecast as a single Bernoulli trial, wouldn’t that make them 60% accurate for the opposite of their prediction?

Which is a silly assumption; a forecast isn’t a single yes-no event. it’s not obvious to me that 50% is the worst case success rate.

Would be more interesting to compare their forecast to something like a long term NOAA forecast, but I don’t believe such a thing exists because calculating the future is very expensive.



GP did say it was just in reference to whether the winter will be warmer or colder than the last one, which is 50/50

In which case if they're 40% accurate, you can get 60% accuracy from them by assuming it'll be the opposite of what they say

If they could get their accuracy down to 0% you'd have perfect predictions!




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