VSA Test Bar

VSA Test Bar asks the follow-up question of volume spread analysis and grades the market's answer — the first faithful build of the test bar as a full detection sequence. High-volume down bars register supply areas; a later probe of that area on narrow spread and clearly low volume, closing firm and holding the area low, prints a Test label with a dashed invalidation line at the test bar's low.

How to Trade the VSA Test Bar?

• Test: a probe of prior supply under both volume thresholds, closing at or above the Minimum Close Position — a question posed, not yet an entry.
• Test Confirmed: an up bar that closes firm on volume above the test bar's own, inside the window; the line turns solid, the area recolors bullish, and the classic stop sits below the test low.
• Test Negated: no qualifying response in time, or a close below the test low — marked with a small cross.
• Failed Test: the probe instead draws heavy volume; supply is still present, and the area recolors bearish.

It slots into the wider volume and order-flow family.

VSA Test Bar Settings

• Average Length (default 20): baseline averages for volume and spread.
• Low Volume Threshold (default 0.7): maximum test volume as a multiple of that average.
• Max Fraction Of Supply Volume (default 0.5): the test must also print well below the probed area's volume.
• Maximum Spread Multiple (default 1.0) and Minimum Close Position % (default 50): the narrow-spread, firm-close anatomy.
• Supply Bar Volume Multiple (default 1.5) and Context Lookback (Bars) (default 50): what registers as supply and how long it stays valid.
• Confirmation Window (Bars) (default 5), Flag Failed Tests (on) and Failed Test Volume Multiple (default 1.5): the response rules.
• Show Supply Area and Show Invalidation Line (both on): the drawings.

Frequently Asked Questions

How does a test differ from a no supply bar?

A no supply bar is a single-bar read: a down close printing a narrow bar on shrinking volume, anywhere. The test demands context — prior high-volume supply whose lows held, a probe into that area, and a confirming response.

Why does the test need prior supply?

Low volume on a dip means little in a vacuum. The build demands a recent supply area whose low has held — overlapping supply bars extend one area — and breaks the context the moment a bar closes below the area low.

Does it work on symbols without volume?

No — volume is the verdict itself, so a symbol reporting none raises an error. Data-window series Relative Volume and Close Position % expose the measurements behind every test.