This is a Real time volume Delta indicator which has to run real time on the chart to capture observation.
Start it when the session starts and log the data and observe. It plots histograms as well as candlesticks of the the cumulative volume delta, from the style switch whichever you want.
It is done based on real time tick and not based on candlesticks, so the accuracy of volume delta is more. Uptick volumes are added as buy and downtick volumes as sell which is the actual way of calculating CVD
Apply the CVD concepts for trading results.