A technical analysis oscillator developed by Donald Lambert. It compares the current typical price ([High + Low + Close] / 3) with a simple moving average over a selected period of time usually 14 or 20. The oscillator values are normalized by using a divisor based on mean deviation. The majority of the values (about 70%) fluctuate between -100 and +100. Buying opportunities are suggested above +100 and selling opportunities below -100 while the same levels may be considered as overbought and oversold by others.
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