The McClellan Summation Index above is a breadth indicator derived from the McClellan Oscillator, which is a breadth indicator based on Net Advances (advancing issues less declining issues). The Summation Index is simply a running total of the McClellan Oscillator values. Even though it is called a Summation Index, the indicator is really an oscillator … Continue reading (100% recent accuracy) NYSI McClellan Summation Index + Parabolic SAR