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Too Much Efficiency Makes Everything Worse: Overfitting and the Strong Version of Goodhart's Law
Jascha Sohl-Dicksteinsohl-dickstein.github.ioHowever, if the strategy is a long–short dollar-neutral strategy (i.e., the portfolio holds long and short positions with equal capital), then 10 percent is quite a good return, because then the benchmark of comparison is not the market index, but a riskless asset such as the yield of the three-month US Treasury bill (which at the time of this writ
... See moreErnest P. Chan • Quantitative Trading
The same idea applies to investing. The continuous goal, in my case, is a portfolio that has distinct advantages versus the market along dimensions like value, momentum, capital allocation, etc. There are no price targets, no return targets, no staking my results on a given outcome for a given company. A goalless process like this is incredibly ha
... See morePatrick O'Shaughnessy • Growth Without Goals
Kauffman Fellows • Venture Fund Portfolio Construction | Journal | Kauffman Fellows
Kauffman Fellows • Venture Fund Portfolio Construction | Journal | Kauffman Fellows
Big Ideas 2020
research.ark-invest.comEven if their forecasts were true (they aren’t), no individual can get the same returns as the market unless he has infinite pockets and no uncle points. This is conflating ensemble probability and time probability. If the investor has to eventually reduce his exposure because of losses, or because of retirement, or because he got divorced to marry
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