full article here
http://financialsense.com/fsu/editorials/m.../2006/0518.html
..."So what is a Hindenburg Omen? It is the alignment of several technical factors that measure the underlying condition of the stock market — specifically the NYSE — such that the probability that a stock market crash occurs is higher than normal, and the probability of a severe decline is quite high. This Omen has appeared before all of the stock market crashes, or panic events, of the past 21 years. All of them. No panic sell-off occurred over the past 21 years without the presence of a Hindenburg Omen. The way Peter Eliades put it in his Daily Update, September 21, 2005 (Peter is well worth the read, believe me), 「The rationale behind the indicator is that, under normal conditions, either a substantial number of stocks establish new annual highs or a large number set new lows — but not both.」 When both new highs and new lows are large, 「it indicates the market is undergoing a period of extreme divergence — many stocks establishing new highs and many setting new lows as well. Such divergence is not usually conducive to future rising prices. A healthy market requires some semblance of internal uniformity, and it doesn』t matter what direction that uniformity takes. Many new highs and very few lows is obviously bullish, but so is a great many new lows accompanied by few or no new highs. This is the condition that leads to important market bottoms.」
..."Based upon the five parameters noted above, here』s what we found: Confirmed Hindenburg Omens are very rare. Including the confirmed Hindenburg Omen we have now, April 10th, 2006, and extended due to the April 17th signal, there were only 24 confirmed Hindenburg Omen signals over the past 21 years. This is amazing when you consider that during that time span, there were roughly 5,250 trading days. Of those 5,250 trading days where it was possible to generate a Hindenburg Omen, only 168 (3.2 percent) generated one, clustering into 24 confirmed stock market crash signals."
..."What does it mean for traders and investors when we get a confirmed Hindenburg Omen? This is really important to understand. A confirmed Hindenburg Omen is not a guarantee of a stock market crash. The odds of a crash based upon the history since 1985 is 26.1 percent. That means the odds we will not have a crash are quite high, at 73.9 percent. However, since a stock market crash is akin to economic death in many circles, you can look at the situation like this. If you were hearing from your doctor that the surgury you are contemplating stands a 26.1 percent of you dying, that becomes a very high percentage probability – one you likely do not want to take if the surgury is not absolutely necessary. A 26.1 percent probability of a stock market crash is extremely high when you consider that there have been only half a dozen over the past twenty years, and the normal odds of a crash happening randomly are only about one-tenth of one percent. You now also have to factor that the Fed is pumping liquidity to prevent crashes once these signals occur. So you do not want to go short the farm. You may want to think about taking prudent precautionary action according to your investment advisor given the much higher than normal odds of a crash. That may not mean shorting. It may mean increasing cash positions or hitting the sidelines for a while. Or it may mean a carefully constructed shorting strategy developed with your advisor, that limits lossses, and invests only the amount which you can afford to lose. Still, it is interesting that even with the heavy liquidity the Fed has been pumping around the time of the past two signals, the odds of a 5 percent decline or more remain pretty high at 73.8 percent. "