MDA - Market Direction Analysis

[pstuartb]

Helene Meisler had an interesting chart on thestreet.com this morning. It's "up volume as a percentage of down volume on a 30-day moving average," which she compares to the S&P, showing how they peak more or less simultaneously. Does anyone know how to create a chart of "up volume as a percentage of down volume on a 30-day moving average" on Stockcharts? TIA