Outside Day

An outside day is a session whose high is above the prior session’s high and whose low is below the prior session’s low. It swallows the previous range, a wide bar that takes out both sides. It is read by its own close: an up close leans bullish, a down close leans bearish.

How to spot it

• The session’s high is above the prior session’s high.
• The session’s low is below the prior session’s low, so it engulfs the whole prior range.
• The close sets the direction: an up close (close above open) reads bullish, a down close reads bearish.
• Sessions are read off the regular trading hours, so this is a daily pattern.

Why it matters

An outside day has already broken both ways inside a single session. The question is whether the way it closed says anything about what comes next, whether that wide bar is a genuine trend bar or just a day of churn that happened to resolve one way. Traders who read it as a trend bar trail the close direction; those who read it as a dislocation fade it. The data below settles which, if either, holds an edge.

Does it actually work?

A pattern is a setup, not a trade, so the question is not “did it win” but “how much room did the move offer before the read was proven wrong.” The tabs below answer that on the index futures with a regular session (Nasdaq and S&P 500), on the daily chart.

For each outside day we measure the room price offered in the close direction, in units of the pattern’s own risk, then set it against a random entry on the same market. When the close direction offers more room more often than chance, that shows up as a real edge. When it does not, the page says so plainly.

How we measured it

• Entry is the close of the outside day.
• One unit of risk, 1R, is the distance from that close to the session’s invalidation extreme: its low for an up close (a long), its high for a down close (a short). A move back through there says the read is wrong.
• We follow the next 20 bars and record how far price ran in the close direction, in multiples of that risk, before the stop was hit.
• Every figure is set against a random entry on the same market, so the market’s own drift is accounted for.
• No profit target and no position sizing. This measures only the room the pattern tends to offer.

What this page does not cover

• Conditioning on the size of the engulfing bar.
• Whether the outside day formed in a trend or in chop.
• A profit target or position sizing. Where you take profit, and how much you put on, are strategy decisions this page leaves to you.

FAQ

Is an outside day bullish or bearish?

Neither by itself. It takes out both the prior high and the prior low, so it has already gone both ways inside the bar. This page reads it by its own close direction and measures how much room that direction then offers compared with a random entry, so you can see whether the close actually leans bullish or bearish on this market.

Does an outside day predict the next day’s direction?

That is what the page measures. Rather than a folklore yes or no, it shows how far price tends to run in the close direction relative to chance. A reading near the random baseline means the close told you little; a clear edge means it leaned one way.