Did you hear about the time Pearson was caught for talking out of turn at a statistical conference about discordant relationships?
I guess he was accused of taking Yule's Q!
*Wow! This has to be one of the most obscure indices you will ever find in the statistical literature. However, one could always say, "IT WAS THERE FOR THE TAKING." Thanks to John Hansen, a doctoral student at Indiana University, for sending this rare gem.
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