The MACD oscillator converts the two lines of the MACD into a single line that fluctuates above and below zero. The MACD oscillator is calculated by subtracting the signal line value from the MACD line value. When the MACD line crosses the signal line, a buy or sell signal is generated. The signals provided by the MACD or the MACD oscillator are identical. The choice of one over the other is simply a matter of user preference. For more information on the formula used to calculate the MACD oscillator, see see, Appel, Gerald, The Moving Average Convergence-Divergence Trading Method, New York: Signalert Corporation.MACD Oscillator
