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Misleading Means: On Drugs and Discrimination
How do you estimate the prevalence of HIV among drug addicts? In a perfect (though somewhat Orwellian) world you'd have a giant list of all drug users, and you'd randomly select a subset of them to test for HIV. Alas, the world is messy, and we're left to less rigorous methods, for example... »
Yes, You Are (Maybe) Overconfident
218 of you took our calibration quiz, not counting the 10% of submissions that had to be thrown out for not being complete or giving ranges with the min greater than the max or other sanity check failures. (Here's the raw data.) The bad news is that you're terrible at making 90% confidence... »
Are You Overconfident?
We shall now find out if Messy Matters readers are smarter than Mechanical Turkers. For each of the questions below, provide a numerical range that you are 90% sure contains the correct answer. In particular, if you have “no idea” then give a very wide range; and if you happen to be... »
Prediction Without Markets
In the 2008 Summer Olympics Usain Bolt ran 100 meters in 9.69 seconds, earning the gold medal and garnering the international attention that comes with being the "fastest man in the world." While Bolt became a household name, his competitors didn't fare nearly as well: far fewer people... »
Scroogenomics vs Ulterior Motives (and Other Justifications for Gift Giving)
As a poser economist (as Jeff Ely calls me), I love to complain about the social inefficiency of gift giving. It's a terrible idea, guys! We waste 13 billion dollars a year on it! But I do appreciate that I have a tendency to pooh-pooh social conventions far too... »