Category Archives: Paul Desmond

Update: Lowry’s 90% Downside Day

On January 28, 2014, Barry Rithholtz came out with a piece about Lowry’s 90/90 Day indication.  The article suggested that more downside days were likely as 90% downside days were not quickly resolved to the upside.

On January 31, 2014, we reviewed the available data on Lowry’s 90/90 Day indicator. Our concluding commentary at the time was as follows:

“The result of our narrow interpretation of the data indicates that the average decline of the market, by the time of the first 90% Downside Day, was -48% of the total expected decline.”

“What does this analysis suggest for the January 24, 2014 90% Downside Day?  On the conservative side the Dow Industrials could bottom at 15,144.16.  On the extreme the slide in the market could end at 14,076.66.”

Below is the illustration of where the January 24, 2014 decline stood relative to the peak at 16,576.66 and the bottom at 15,372.80 and the subsequent rise that followed.

image

A distinction that needs to be made is Rithholtz’s assertion that the 90% Downside Day was reflective of an impending decline of at least –10% in the market.  However, our limited review of the data has suggested that the very first 90% Downside Day had typically come when almost half of the down move had passed. 

More data is needed so drop us a line if you see any reference to the next 90% Downside Day and we’ll run the numbers again to see what the market might do.

Review: Lowry’s 90% Downside Days

On January 28, 2014, Barry Ritholtz did a Bloomberg piece titled “Friday was a 90/90 Day and What It Means (found here)”.  In that article, Ritholtz explains the “90/90” as follows:

“When markets experience a bout of intense selling -- those trading sessions when 90 percent of the volume is down, and nine out of 10 stocks close lower -- it can mark a short-term reversal in a bull run. Typically, it signifies a shift in psychology among larger institutions.”

“Looking at the past examples of deep 90/90 sell offs, we have seen only modest rebounds followed by more selling after days such as Friday.”

In general, Ritholtz gives a vague idea on the concept however a detailed explanation is found in the 2002 article by Paul Desmond of Lowry’s Reports titled “Identifying Bear Market Bottoms and New Bull Markets (found here).”  In the Desmond article, there are some key concepts that are outlined.  Foremost is the idea that “…Important market bottoms are preceded by, and result from, important market declines…(page 3)” and “…if an investor had a method for identifying and measuring panic selling, at least half the job of spotting major market bottoms would be at hand...(page 3)”.

In the pursuit of identifying and measuring panic selling, Desmond’s research found that “…almost all periods of significant market decline in the past 69 years have contained at least one, and usually more than one, day of panic selling in which Downside Volume equaled 90.0% or more of the total of Upside Volume plus Downside Volume, and Points Lost equaled 90.0% or more of the total of Points Gained plus Points Lost…(page 4)”.  Desmond’s work on the topic covers the period from 1960 to 2002 with every date that the Dow Jones Industrial Average experiences 90% Upside or Downside days.

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