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[Archives] Investing Holy Grail: Brain Or Machine?

Investing Holy Grail: Brain Or Machine? by Wade W. Slome, CFA, CFP®, Investing Caffeine

Paul Meehl was a versatile academic who held numerous faculty positions, covering the diverse disciplines of psychology, law, psychiatry, neurology, and yes, even philosophy. The crux of his research was focused on how well clinical analysis fared versus statistical analysis. Or in other words, he looked to answer the controversial question, “What is a better predictor of outcomes, a brain or an equation?” His conclusion was straightforward – mechanical methods using quantitative measures are much more efficient than the professional judgments of humans in coming to more accurate predictions.

Those who have read my book, How I Managed $20,000,000,000.00 by Age 32 know where I stand on this topic – I firmly believe successful investing requires a healthy balance between both art and science (i.e., “brain and equation”). A trader who only relies on intuition and his gut to make all of his/her decisions is likely to fall on their face. On the other hand, a quantitative engineer’s sole dependence on a robotic multi-factor model to make trades is likely to fail too. My skepticism is adequately outlined in my Butter in Bangladesh article, which describes how irrational statistical games can be misleading and overused.

As much as I would like to attribute all of my investment success to my brain, the emotion-controlling power of numbers has played an important role in my investment accomplishments as well. The power of numbers simply cannot be ignored. More than 50 years after Paul Meehl’s seminal research was published, about two hundred studies...


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