Relative Volatility Index: the RSI built on volatility

Your moving average crosses up, you buy, and price chops sideways for the next two hours before rolling over. The cross was real. What was missing was any sign that the market’s energy was leaning your way. The relative volatility index was built to answer that single question: is recent volatility coming on up closes or down closes?

By the end you will know how to read the RVI as a yes or no filter, and how to tell it apart from the other tool that shares its initials.

What is the relative volatility index?

The relative volatility index is a 0 to 100 oscillator that shows which way volatility is leaning. Donald Dorsey published it in the June 1993 issue of Technical Analysis of Stocks & Commodities magazine, and later refined it to average readings taken from highs and lows. Investopedia’s entry on the indicator describes the same structure.

The build borrows Welles Wilder’s RSI almost whole. Where RSI averages how far price moved up or down on each bar, the RVI takes a short standard deviation of closes, a measure of how spread out recent prices are, and files it under “up” or “down” depending on whether that bar closed higher or lower than the last. Each pile is smoothed, and the up pile is expressed as a share of the total.

The lower panel holds above 50 through the climb and slips under it a few bars after the top, once the down closes start carrying the wider swings. It confirms the turn; it does not call it.

How is the RVI different from RSI, ATR and the Relative Vigor Index?

The RVI measures the direction of volatility, while RSI measures the direction of price change and ATR measures the size of volatility. The Relative Vigor Index is a separate tool entirely that happens to share the abbreviation.

That last row trips people up constantly. Many platforms list both as “RVI”. If a tutorial talks about a signal line crossing, it is almost certainly describing the Relative Vigor Index, which reads each candle’s close against its open, not Dorsey’s tool.

Why does a high RVI not mean a volatile market?

Because the RVI is a ratio. A quiet market where every small swing happens on up closes can read 70, while a violent market split evenly between up and down closes can sit near 50.

That is why it pairs so naturally with a size measure. ATR tells you how far bars are travelling, and that is what sets your stop and your position size. The RVI only tells you which side that travel is favouring. Read one without the other and you have half the picture.

How do you use the RVI as a confirmation filter?

Take the signal from your main tool, then let the RVI vote. Longs only when it reads above 50, shorts only when it reads below 50, and nothing when it disagrees. That is close to how Dorsey framed it.

The filter only ever removes trades. It never adds one your main method did not already propose, which is exactly why it is hard to overfit.

A few habits keep it honest:

• Read the RVI on the closed bar, the same bar your main signal fired on.
• Leave the default lengths alone until you have a baseline. Most builds use a short deviation window and a Wilder-style smoothing close to RSI’s.
• Count the vetoes during a replay session. If the filter blocks nearly everything, the main tool and the RVI are disagreeing about the market you trade.

Where does the RVI let you down?

In ranges, and on its own. When price is going sideways, the up and down closes carry similar dispersion and the RVI hovers around 50, flipping sides on noise. A filter sitting on the fence is not filtering.

It also lags. The deviation window and the smoothing both look backward, so a sharp V-shaped reversal can be well underway before the reading crosses. And the indicator has no stop, no target and no idea what your account can take. Fixed risk per trade and a defined exit still do the protecting; the RVI only sharpens which trades you take. If you want the plain dispersion number without the direction split, the standard deviation indicator on its own gives you that.

Does the relative volatility index repaint?

A standard build does not rewrite closed bars. Each value uses only closes that already exist, so yesterday’s reading is still yesterday’s reading tomorrow. On the candle still forming, the latest close keeps changing, and so does the RVI.

That movement is ordinary recalculation, not a redrawn history. Make the decision on the closed bar. If you want to confirm a particular copy behaves, step through it in bar replay and check that past values never move. The walkthrough on what a non-repaint indicator does and does not guarantee covers that test in detail.

Where RelicusRoad Pro fits

The RVI is a good second opinion, but it is only as useful as the first opinion it is checking. If your main signal can change its mind before the candle closes, the filter is voting on a moving target. RelicusRoad Pro confirms its levels and signals at the candle close on MT4, MT5 and TradingView, which gives a volatility filter like the RVI something fixed to agree or disagree with.

Frequently asked questions

What is the relative volatility index?

The relative volatility index, or RVI, is an oscillator from 0 to 100 that shows whether recent volatility has been happening on up closes or down closes. Donald Dorsey introduced it in Technical Analysis of Stocks & Commodities magazine in 1993. It uses the same structure as Welles Wilder’s RSI, but instead of averaging the size of up and down price changes, it averages the standard deviation of closes, split by whether the bar closed higher or lower than the one before.

How do you read the relative volatility index?

Read it against the 50 line first. Above 50, most of the recent volatility arrived on rising closes, which supports long setups. Below 50, it arrived on falling closes, which supports shorts. Dorsey intended the reading as a yes or no check on a signal from another tool, such as a moving average cross, rather than as an entry trigger in its own right.

What is the difference between the RVI and RSI?

Both oscillate between 0 and 100 and both split recent bars into up and down groups. RSI averages how far price moved on each bar. The relative volatility index averages the standard deviation of closes over a short window instead. Because standard deviation measures dispersion rather than distance, the RVI can disagree with RSI, and Dorsey built it partly to act as an independent second opinion alongside RSI.

Is the relative volatility index the same as the Relative Vigor Index?

No. Both are shortened to RVI, which causes real confusion on trading platforms. The relative volatility index, by Donald Dorsey, looks at the direction of volatility across closes. The Relative Vigor Index looks at where each candle closes relative to its open and its range, and it is traded on crossovers with a signal line. Check the full name in the indicator settings before you trust any RVI tutorial.

Does the relative volatility index repaint?

A standard build does not. Each value depends only on closes that have already happened, so once a candle closes its RVI value is fixed. On the candle still forming, the value moves with every tick because the latest close keeps changing. Judge the 50 line only on closed bars and the reading you act on will match the one you see later.

Want a main signal that stays put for your RVI filter to judge? See how RelicusRoad Pro confirms at the candle close.

Written for RelicusRoad by RelicusDigital.com.