The Volume ROC indicator compares the most current bar¦s volume to the
volume of a bar in the past. The difference is calculated as a percentage
and fluctuates above and below a zero line. Volume can provide insight
into the strength or weakness of a price trend. A positive value suggests
there is enough market support to continue to drive price activity in the
direction of the current trend. A negative value suggests there is a lack of
support and prices may begin to become stagnant or reverse.