What it means
Price alone can mislead, because a move on very few trades may mean little. TSV adds volume to the picture by multiplying each period's price change by that period's volume.
Large moves on high volume produce large positive or negative numbers, while small moves on thin volume produce small ones. The values are added up over a lookback period.
Many platforms use somewhere between 13 and 18 periods, and the setting can be changed to react faster or more smoothly. The result is drawn as a line around a zero level.
A reading above zero suggests net buying pressure, sometimes called accumulation, and a reading below zero suggests net selling pressure, or distribution. Traders also add a signal line, which is a moving average of the TSV line, and watch for crossovers as possible turning points.
Divergence is another common use. If the price makes a new high while TSV fails to do so, it hints that fewer buyers are behind the rally, and the move may be losing strength.
The reverse can happen at lows. TSV is only a confirmation tool.
It uses past data, depends on accurate volume figures, and is less meaningful for assets with unreliable volume data. Most traders combine it with price patterns, trend lines and other indicators rather than acting on it alone.
A practical point is that volume data differs between markets. Shares on a single exchange have reliable volume, while some currency and over-the-counter markets do not, which weakens any volume-based indicator.
In practice
Real-world examples.
Example
A swing trader sees a share break above resistance. TSV is above zero and rising, which supports the view that real buying is behind the breakout.
Example
A portfolio manager notices that a stock keeps making new highs, but TSV has been falling for three weeks. She trims the position, treating the divergence as an early warning. She keeps the rest of the holding because the longer-term trend is still intact.
Example
A commodity analyst writes a note on a metal that fell on heavy volume. TSV drops sharply below zero, which supports the view that sellers are in control and that a quick recovery is unlikely. She waits for the line to turn back above zero before buying.
Formula
Calculation
TSV = Sum over the lookback period of (Close today - Close yesterday) x Volume today
Practitioners use 13 to 18 periods, but a 4-day example shows the arithmetic. A share closes at $50 on day 0, then $51, $50.50, $52 and $53 on days 1 to 4, with volumes of 10,000, 8,000, 12,000 and 20,000 shares.
The daily price changes are +1.00, -0.50, +1.50 and +1.00. TSV = (1.00 x 10,000) + (-0.50 x 8,000) + (1.50 x 12,000) + (1.00 x 20,000) = 10,000 - 4,000 + 18,000 + 20,000 = 44,000. The positive total suggests buying pressure supported the rise. Note how the heavy volume of 20,000 shares on the last day carries the biggest weight.Case study
Seen in the real world.
Northcliff Capital is an illustrative, fictional trading firm that tested TSV with a 13-day lookback on 50 mid-sized shares. The rule was to buy when TSV crossed above zero while the price was above its 50-day average.
Over the test period, trades that met both conditions won 58% of the time, against 49% for trades based on the price condition alone. The difference was meaningful, but the analyst warned that the test covered only one market phase and that past results do not guarantee future ones.
The illustrative lesson is that TSV added information as a filter, not as a standalone system. Northcliff kept the rule in its research list, planned to test it again in different market conditions and never sized trades on TSV alone. The analyst also recorded the transaction costs, which reduced the apparent edge by about a third.
Watch out
Common mistakes.
- Using TSV on assets with poor volume data, which makes the numbers unreliable.
- Reading a single crossover as a certain signal, when false signals are common, especially in markets that move sideways.
- Treating TSV as a forecast of price, when it only summarises past price changes weighted by volume.
Questions
People also ask.
What does a positive TSV mean?
Price gains on volume have outweighed losses over the lookback period, which suggests buying pressure.
What lookback period should I use?
Many traders use 13 to 18 periods, and shorter settings react faster but produce more false signals, so the choice should be tested on past data first.
How is TSV different from on-balance volume?
Both link price to volume, but TSV weights each volume by the size of the price change instead of only its direction, and it uses a rolling window.
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