Here's an old but good 17 page article:
"The historical record shows that 90% Downside Days do not usually occur as a single incident on the bottom day of an important market decline, but typically occur on a number of occasions throughout a major decline, often spread apart by as much as thirty trading days. For example, there were seven such days during the 1962 decline, six during 1970, fourteen during the 1973-74 bear market, two before the bottom in 1987, seven throughout the 1990 decline, and three before the lows of 1998." ......
and
"Thus, our 69-year record shows that declines containing two or more 90% Downside Days usually persist, on a trend basis, until investors eventually come rushing back in to snap up what they perceive to be the bargains of the decade and, in the process, produce a 90% Upside Day (in which Points Gained equal 90.0% or more of the sum of Points Gained plus Points Lost, and on which Upside Volume equals 90.0% or more of the sum of Upside plus Downside Volume). These two events – panic selling (one or more 90% Downside Days) and panic buying (a 90% Upside Day, or on rare occasions, two back-to-back 80% Upside Days) – produce very powerful probabilities that a major trend reversal has begun, and that the market’s Sweet Spot is ready to be savored."
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