Jun

17

In his studies of Life Histories, Eric Charnov likes to look at the sex ratio as it is feeds back with clutch size, weight, and resources.

He makes the point that often ratios are invariant and that there are many causes that contribute to the invariance, which must be teased out of the variability of what we would call demographic variables.

Inspired by Charnov, I looked at the sex ratio that follows periods without sunlight in the form of a daily rise or decline in the S&P, a factor almost as crucial as sex and its ratios to many market participants.

The period covered was the last 10 years of data, during which the unconditional chance of a daily decline was 0.52.

The sex ratio appears to be much more constant after days of sunhine for bulls.


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