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Several years back I was running some long term experiments that did just that (combine Piotroski + MF, CAPS + MF, MSN + MF, Stocks 360 + MF etc etc) and over longer periods of time, and in every single case, pure random selections had better outcomes.

A good example is the MFI CAPS page here (which I've voluntarily managed for over 5 years now): Total Score: 785.06 (88th percentile) and average pick score of +3.91 above the S&P. - Not too shabby for a mechanical screen.

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