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On Balance Volume

Description

On Balance Volume relates volume to price change.  It is calculated by adding the day's volume to a cumulative total when the security's price closes up, and subtracting the day's volume when the security's price closes down.

If today's close > yesterday's close then
  OBV = yesterday's OBV + today's volume
If today's close < yesterday's close then
  OBV = yesterday's OBV - today's volume
If today's close = yesterday's close then
  OBV = yesterday's OBV

Interpretation

On Balance Volume is a running total of volume. It seeks to show if volume is flowing into or out of a security. When the security closes higher than the previous close, all of the day's volume is considered up-volume. When the security closes lower than the previous close, all of the day's volume is considered down-volume.

Joe Granville is the father of OBV and its analysis. We can barely begin to explain a simplified version of OBV inter­pretation here. If you want further information on OBV analysis, we recommend that you read his book, New Strategy of Daily Stock Market Timing for Maximum Profits.

The basic assumption, regarding OBV analysis, is that OBV changes precede price changes.  The theory is that smart money can be seen flowing into the security by a rising OBV. When the public then moves into the security, both the security and the OBV will surge ahead.

If the security's price movement precedes OBV movement, a "non-confirmation" is said to have occurred. Non-confirma­tions can occur at bull market tops (when the security rises without, or before, the OBV) or at bear market bottoms (when the security falls without, or before, the OBV).

The OBV is said to be in a rising trend when each new peak is higher than the previous peak and each new trough is higher than the previous trough. Likewise, the OBV is in a falling trend when each successive peak is lower than the previous peak and each successive trough is lower than the previous trough. When the OBV is moving sideways and is not making successive highs and lows, it is in a doubtful trend.

Once a trend is established, it remains in force until it is broken. There are two ways in which the OBV trend can be broken. The first occurs when the trend changes from a rising trend to a falling trend, or from a falling trend to a rising trend.

The second way the OBV trend can be broken is if the trend changes to a doubtful trend and remains doubtful for more than three days. Thus, if the security changes from a rising trend to a doubtful trend and remains doubtful for only two days before changing back to a rising trend, the OBV is consid­ered to have always been in a rising trend.

When the OBV changes to a rising or falling trend, a breakout is said to have occurred. Since OBV breakouts normally precede security breakouts, investors should buy long on OBV upside breakouts. Likewise, investors should sell short when the OBV makes a downside breakout. Positions should be held until the trend changes (as explain­ed in the preceding paragraph).

This method of analyzing On Balance Volume is designed for trading short-term cycles. According to Granville, investors must act quickly and decisively if they wish to profit from short-term OBV analysis.