abstract:The McClellan oscillator is a market breadth indicator used in Technical analysis by financial analysts of the New York Stock Exchange to evaluate the rate of money entering or leaving the market and interpretively indicate overbought or oversold conditions of the market.Illustrative description by McClellan Publications of the McClellan Oscillator The McClellan Oscillator is based on the Advance-Decline Data and it could be applied to stock market exchanges, indexes, portfolio of stocks or any basket of stocks.