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Lumifer comments on Open Thread, Dec. 28 - Jan. 3, 2016 - Less Wrong Discussion
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From my internal view I'm sceptical of it because I'm familiar with it :-/
Um, hiring from top colleges is not quite all signaling. There is quite a gap between, say, an average Stanford undergrad and an average undergrad of some small backwater college.
Um, I was one of Tetlocks' forecasters for a year. I wasn't terribly impressed, though. I think it's a bit premature to declare that they "solved the problem".
With people who claim to have awesome forecasting power or techniques, I tend to point at financial markets and ask why aren't they filthy rich.
You're right, I was assuming things about you I shouldn't have.
Fair point. But the point is that they're going on something like "the average undergrad" and discounting all the outliers. Especially problematic in this case because forecasting is an orthogonal skillset to what it takes to get into a top college.
Markets are one of the best forecasting tools we have, so beating them is hard. But using the market to get these types of questions answered is hard (liquidity issues in prediction markets) so another technique is needed.
What part specifically of that paper do you think was unimpressive?
Not necessarily. Recall that a slight shift in the mean of a normal distribution (e.g. IQ scores) results in strong domination in the tails.
Besides, searching for talent has costs. You're much better off searching for talent at top tier schools than at no-name colleges hoping for a hidden gem.
What "types of questions" do you have in mind? And wouldn't liquidity issues be fixed just by popularity?
Let me propose IQ as a common cause leading to correlation. I don't think the skillsets are orthogonal.
I read it a while ago and don't remember enough to do a critique off the top of my head, sorry...
That's the signalling issue - I'm trying to create a better signal so you don't have to make that tradeoff
Question Example: "How many units will this product sell in Q1 2016?" (Where this product is something boring, like a brand of toilet paper)
This is a question that I don't ever see being popular with the general public. If you only have a few experts in a prediction market, you don't have enough liquidity to update your predictions. With prediction polls, that isn't a problem.
Why do you call that "signaling"? A top-tier school has a real, actual, territory-level advantage over a backwater college. The undergrads there are different.
I don't know about that not being a problem. Lack of information is lack of information. Pooling forecasts is not magical.
Because you're going by the signal (the college name), not the actual thing you're measuring for (forecasting ability).
I meant a problem for frequent updates. Obviously, less participants will lead to less accurate forecasts - but by brier weighting and extremizing you can still get fairly decent results.