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These criteria are calculated daily using Wall Street Journal figures for consistency. (Other exchanges may be used as well.) Some have been recalibrated by Miekka to reduce statistical noise and make the indicator a more reliable predictor of a future decline.
The daily number of NYSE new 52 week highs and the daily number of new 52 week lows are both greater than or equal to 2.8 percent (typically, 84) of the sum of NYSE issues that advance or decline that day (typically, around 3000). An older version of the indicator used a threshold of 2.5 percent of total issues traded (approximately 80 of 3200 in today's market).
The NYSE index is greater in value than it was 50 trading days ago. Originally, this was expressed as a rising 10 week moving average, but the new rule is more relevant to the daily data used to look at new highs and lows.
The McClellan Oscillator is negative on the same day.
New 52 week highs cannot be more than twice the new 52 week lows (though new 52 week lows may be more than double new highs).
The traditional definition requires each condition to occur on the same day. Once the signal has occurred, it is valid for 30 days, and any additional signals given during the 30-day period should be ignored. During the 30 days, the signal is activated whenever the McClellan Oscillator is negative, but deactivated whenever it is positive.
The Hindenburg Omen is a combination of technical factors that attempt to measure the health of the NYSE, and by extension, the stock market as a whole. The goal of the indicator is to signal increased probability of a stock market crash.
The rationale is that under "normal conditions" either a substantial number of stocks may set new annual highs or annual lows, but not both at the same time. As a healthy market possesses a degree of uniformity, whether up or down, the simultaneous presence of many new highs and lows may signal trouble.