Stock Or Not?

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We post this with a firm warning. We're finding Stock or Not highly, highly addictive. The way it works is that you try to guess whether a given chart is a stock or not. On one side is a real stock, and on the other is a randomly generated chart. We find we're fooled by randomness about 20% of the time (the picture above shows an even worse perfomance) but can't account for why we should be so accurate.
We're very mad at Felix Salmon for introducing us to this.

Stock Or Not
[I2pi.com]

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