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Mass Index - Technical Analysis from A to Z
The Mass Index was designed to identify trend reversals by measuring the narrowing and widening range between high and low prices. As this range widens, the Mass Index increases; as the range narrows, the Mass Index decreases. Donald Dorsey developed the Mass Index. According to Mr. Dorsey, the most significant pattern to watch is a "reversal bulge." A reversal bulge occurs when a 25-period Mass Index rises above 27.0 and subsequently falls below 26.5. A reversal in price is then likely. The overall price trend (i.e., trending or trading range) is unimportant.