The Positive Volume Index (PVI) is a useful indicator to understand price behaviour in case of higher trading activity. By focusing on higher-volume periods, PVI can help traders identify market trends and momentum.

Unlike other indicators, which analyse each trading day equally, the Positive Volume Index pays attention to the moments when more stocks were traded compared to the previous trading period.

This article explains what PVI is, how it works, the formula, and how to calculate it.

Key Takeaways

• PVI updates only on high-volume days, isolating price behaviour during periods of elevated trading activity.
• Traditional technical theory uses PVI to observe market movement driven by broader public participation.
• PVI functions as a confirmation metric and should be evaluated alongside baseline trend indicators rather than as a standalone signal.

How Does Positive Volume Index Work?

PVI starts with a base figure that is normally set at 1,000. After that, the indicator only moves whenever the volume for the day surpasses the volume of the previous period.

Suppose a stock has:

• Previous day’s PVI: 1,000
• Previous day’s close price: ₹100
• Today’s closing price: ₹103
• Today’s volume: Greater than yesterday’s

Given that the volume is higher than before, PVI will rise because of the 3% price increase.

If the volume falls compared with the previous period, PVI does not change.

Also Read About: What is Negative Volume Index or NVI?

Positive Volume Index Formula

This formula might seem a little complicated at the very first glance, but the idea behind it is pretty simple.

If the current volume is greater than the volume in the previous period:

Positive Volume Index = Previous PVI + ([(Current Price – Previous Price) / Previous Price] * Previous PVI)

Or in another way:

Positive Volume Index = Previous PVI * (1 + Percentage Change in Price).

If the current volume equals or is less than the previous period, Positive Volume Index will be the same:

PVI = Previous PVI.

The main thing here is that PVI will change only in case of increased volume.

Positive Volume Index vs Negative Volume Index (NVI): What is the Difference?

They are closely related but focus on different volume situations. Sometimes, traders use both indicators simultaneously because they offer two different perspectives on price behaviour.

Indicator	Volume Condition	Focus
PVI	Volume increases	Price movement during higher-volume periods
NVI	Volume decreases	Price movement during lower-volume periods

Advantages of Positive Volume Index

• Combining it with other indicators: PVI can be used in combination with moving averages, RSI, MACD, trend lines, and support and resistance levels.
• Volume-oriented indicator: Not all days are treated the same in the case of PVI. It is particularly concerned with volume increases.
• Trend identification: The trend of PVI over the long term can give traders an indication of the overall trend of the stock.
• Confirmation tool: PVI can serve as a good indicator of an already established price and volume analysis.

Also Read About: What is Relative Strength Index (RSI)?

Disadvantages of Positive Volume Index

• Cannot predict future trends: It is important to note that the increase in PVI does not mean that the price of the asset will continue to rise.
• Does not explain volume changes: The reasons for changes in volume can be earnings reports, market rumors, activity of institutions, or market panic. The PVI indicator cannot explain changes in volume.
• Can provide false signals: False signals can be provided by the indicator in periods of high market volatility.
• Can act as a lagging indicator: The indicator is mainly used as a confirmatory tool. When a clear trend appears, some price action may already have happened.
• Should not be used alone: Investors should never trade using PVI only. It is much better to use PVI with other technical tools and market analysis.

How to Use Positive Volume Index in Trading?

There is no one right method for applying the PVI. One strategy would be to use the index with a moving average.

A trader might do the following:

• Plot PVI on the stock chart.
• Plot a long-term moving average on top of PVI.
• See whether PVI is above or below the average move.
• Consider the prevailing price trend.
• Confirm the signal using other technical indicators.
• Manage the risks before making the trade.

Suggestion

Practical Application Checklist for Using the Positive Volume Index (PVI)

A rising PVI confirms that price gains are accompanied by expanding trading activity, indicating broader market participation.

Verification Checklist for Practical Use

• Baseline trend: Is the asset overall trend moving in the same direction as PVI, or is PVI showing a divergence?
• Catalyst check: Is high volume driven by an unusual event (e.g., earnings announcements or broader market panic) that could distort technical signals?
• Secondary confirmation: Are complementary tools (such as moving averages or RSI) confirming the direction indicated by PVI?

Conclusion

Positive Volume Index is a technical indicator that focuses on price movements on growing volume. The primary use of this tool is to determine how prices move when the market becomes more active.

The idea behind this indicator is simple:

• If volume grows, PVI moves with the percentage of price movement.
• If there is no growth in volume, then PVI remains stable.

This tool may be useful in trend identification, market sentiment analysis, and confirmation of other technical indicators. But it has some disadvantages and should never be used independently to make investment decisions.