On Balance Volume (OBV) uses volume to confirm price movements. The calculation for On Balance Volume is given below
- On days when the close is greater than the open (i. e. stock posted a gain) then the volume for that day is added to the running OBV total.
- However, when the close is less than the open (i. e. stock posted a loss), then the volume for that day is subtracted from the running OBV total.
When prices move higher or lower on low volume, the On Balance Volume technical analysis indicator will hardly move. This can signal weak participation by traders and is called a divergence. The price movement was not confirmed by volume and therefore is looked upon by traders as a questionable move in which they are unlikely to join in.
Volume is one of the most important parts of technical analysis, arguably second only to price. To learn how to interpret volume click the Volume Analysis link.
Trading is risky. Trade only with money you can afford to lose. Past performance of technical analysis indicators is not indicative of future performance.
Tom Markelson is a contributor to the website and trades stock index futures, stock options, and stock index options.
To visually see the On Balance Volume indicator, a link has been provided: On Balance Volume (OBV)