Friday, September 13, 2013

The present unknown and forecasting

Causality law has it that if we know the present, then we can predict the future. Be aware: In this formulation, it is not the consequence but the premise that is false. As a matter of principle, we cannot know all determining elements of the present.  - Heisenberg

One of the key problems with financial forecasting is that it has low explanatory power. The R-squared of most regressions are very low, less than 10%; consequently, we will not know what are the factors that truly drive returns. We may attribute causality to a news story from the day but that does not mean it is the return driver. We may falsely see correlation as causality.

Beware of the current unknown.

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