Desi MO (McClellans Oscillator for NSE) – 22nd FEB 2021 February 22, 2021February 22, 2021 R M Blog MO at -43 McClellan’s Oscillator – Calculation and Interpretation Indiavix Declining Volumes NSE – McClellan Summation index (MSI) MSI is a summation of MO, hence its absolute value depends upon the beginning date of summation.