VWAP Deviation Score expresses how stretched price is from the session's VWAP as a single z-score number — the count of intraday standard deviations between the current close and the volume-weighted mean. Zero means price is sitting on VWAP. ±1 is one standard deviation away (~68% statistical envelope). ±2 is the alertable extreme (~95% envelope). Beyond ±2 is a statistically uncommon reading under a normal distribution.

The indicator lives in its own pane below price. The smoothed z-score line is colored by zone — green inside ±1σ, amber between ±1σ and ±2σ, red beyond ±2σ — so the current state is readable at a glance. Three confirmed-bar alerts cover the actionable transitions: extreme bullish stretch, extreme bearish stretch, and the return back to VWAP after an extreme reading.

Unlike rolling-window z-score indicators, this one anchors VWAP and the standard deviation to the session open. The dispersion measurement therefore reflects only today's price action, not yesterday's noise — every session starts fresh.

Key Features

Session-Anchored Z-Score — True intraday measurement of stretch from VWAP. Resets every session, no carryover from yesterday.
Three-Zone Coloring — Normal (green), caution (amber), extreme (red). The line color tells you the regime before you read the number.
Configurable Thresholds — Independent caution and extreme threshold inputs (defaults ±1σ and ±2σ). Adjust per instrument volatility.
EMA Smoothing — Optional smoothing of the raw z-score (default length 3) to suppress threshold-flicker on noisy timeframes.
Three Alerts — Extreme bullish deviation, extreme bearish deviation, return to VWAP after an extreme. All confirmed on bar close.
Early-Session Guard — Configurable minimum-bars filter (default 5) prevents noise alerts when intraday standard deviation has not yet stabilised.
Compact Dashboard — Top-right table shows current z-score, zone label, and bar count since session open.
Volume-Agnostic — Works on instruments with or without published volume. Cash indices with no published volume fall back to a flat weight automatically.
No Repainting — Signal conditions gated on confirmed bars; once an alert has fired, the historical signal does not move.

How It Works

At the start of each session the indicator begins accumulating volume-weighted sums of the source price and the source price squared. From these it derives the session VWAP (Σ src·vol / Σ vol) and the volume-weighted variance (Σ src²·vol / Σ vol − VWAP²). The standard deviation is the square root of the variance.

The raw z-score is then (close − VWAP) / σ — the number of standard deviations between the current close and the session mean. A short EMA is applied to the raw value to produce the smoothed signal line shown on the chart.

The score is classified into three zones: normal (|z| < caution), caution (caution ≤ |z| < extreme), and extreme (|z| ≥ extreme). The line colour, the pane background, and the dashboard all reflect the current zone.

Signals fire only on confirmed (closed) bars. "Extreme bullish deviation" fires the bar the smoothed z-score crosses above the extreme threshold; "extreme bearish deviation" mirrors it on the negative side. "Return to VWAP" fires when the score crosses zero after having been beyond the extreme threshold earlier in the same session — paired with the extreme alerts, it marks the completion of a mean-reversion round trip.

Settings

Session Time (default: 0915-1530) and Timezone (default: Asia/Kolkata) define the session window that anchors the VWAP. VWAP Source (default: hlc3) sets the price used in the weighted average; hlc3 matches TradingView's built-in VWAP.

Extreme Threshold (default: 2.0σ) is the alertable line. Caution Threshold (default: 1.0σ) opens the amber zone but does not fire alerts — it is purely a visual aid for the colour band. Signal Smoothing (default: 3) is the EMA length applied to the raw z-score. Min Bars Before Signals (default: 5) suppresses signals while the early-session standard deviation is still stabilising.

The Visual toggles control the optional raw z-score line, the zone fills, the extreme background tint, and the dashboard table. The three Alert toggles enable or disable each alert independently.

Alerts

Extreme Bullish Deviation — Fires on the bar the smoothed z-score crosses above the extreme threshold. Price is in the top tail of the intraday distribution. "VWAP Deviation Score [DYNA]: Z-score crossed above the extreme upper threshold — price stretched well above session VWAP."
Extreme Bearish Deviation — Fires on the bar the smoothed z-score crosses below the negative extreme threshold. Mirror of the bullish case. "VWAP Deviation Score [DYNA]: Z-score crossed below the extreme lower threshold — price stretched well below session VWAP."
Return to VWAP — Fires when the smoothed z-score crosses zero after having been beyond the extreme threshold earlier in the same session. Marks the completion of a mean-reversion round trip. "VWAP Deviation Score [DYNA]: Z-score returned to zero after an extreme deviation — mean-reversion to session VWAP confirmed."

To set up alerts: click TradingView's Alerts button, choose "VWAP Deviation Score [DYNA]" from the condition dropdown, pick one of the three alert variants, and select your notification channel.

Best Practices

Read the line colour first, the number second. The zone tells you the regime; the exact value is for fine-tuning entries.
Extreme readings mark the tails of the intraday distribution — a zone many traders watch for potential mean-reversion. The "Return to VWAP" alert can mark when price has traded back to the session mean.
Tune the extreme threshold per instrument. 2σ is a good default; raise to 2.5-3σ on highly volatile small-caps or crypto, lower to 1.5σ on slow-moving instruments.
Combine with a higher-timeframe trend filter to choose which side of an extreme reading to take. With-trend extreme readings often mark continuation pullbacks; counter-trend extremes mark exhaustion.
Give the indicator at least 5-7 bars after session open before reading it. The minimum-bars guard suppresses alerts but the visible value can still be unstable while standard deviation is stabilising.
On cash-index charts with no published volume, treat this as a session-anchored standardised price oscillator rather than a true volume-weighted z-score. The signal logic is unchanged; only the per-bar weighting falls back to flat.

Part of the DYNA Ecosystem

VWAP Deviation Score is a free indicator built with the same design standards as the DYNA premium suite. For complete trade management with automatic stop loss, break-even, trailing stops, and multi-target systems, explore the full DYNA indicator collection.

Disclaimer

This indicator is a technical analysis and educational tool only — it is not financial advice and makes no guarantee of any outcome. Past performance does not predict future results. Always do your own research and use proper position sizing and risk management.