Tag Archives: Groundhog Day

The mean reversion of Groundhog Day

February 2nd is Groundhog Day.  If Punxsutawney Phil sees his shadow, then he goes back into his burrow and hibernates for six more weeks.  Otherwise he predicts an early spring. It is really a mean reversion idea — current good weather means bad weather later, and vice versa. The other Groundhog Day Most people outside … Continue reading

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