Constance Brown's Derivative Oscillator was published in her book "Technical Analysis for the Trading Professional". The oscillator uses a 14-period RSI . The RSI is then double smoothed with exponential moving averages . The default settings for the smoothing periods are 5 and 3. In a second step a signal line is generated from the smoothed RSI by calculating a simple moving average with a period of 9. The Derivative Oscillator is calculated as the difference between the smoothed RSI and the signal ...