Criteria of selection of potentially bearish stocks are stronger than criteria for potentially bullish stocks. They should be strongly overbought within 16 and 32 day frames. This is why there are some days when the list of bearish stocks is empty. We do not worry much about it. History analysis (1996 - 2002) shows that there were no quarters with negative returns for this strategy even during the powerful bull market in 1996 - 2000. More statistics you can find in our e-book Short-Term Trading Analysis.
The position holding period for the sell-short strategy is shorter than for the basic strategy. It helps to reduce the risk of the strategy.
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