Desi MO (McClellans Oscillator for NSE) – 9th FEB 2021 February 9, 2021February 9, 2021 R M Blog MO at -9 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.