Fractiz
Pattern Detail
Inside Day
How often a session contained inside the prior session's range produces a directional breakout the next day.
Move size vs normal
1.00×
About the same as a normal bar.
Occurrences
516
Compression sessions in the sample.
Break direction
66.1%
Broke out within a session, split 38.4% up / 27.7% down.
Summary
Inside Day is a compression pattern: it signals a coiled range, not a direction. The move that follows is 1.00× a normal bar's range, about normal. The break splits roughly 38.4% up / 27.7% down. Trade the breakout, not a side.
Next-session outcome (direction is not predicted)
| Outcome | Count | Share |
|---|---|---|
| Broke up | 198 | 38.4% |
| Broke down | 143 | 27.7% |
| Indecisive | 175 | 33.9% |
Avg excursion above the range 0.8% · below 1.0%. The breakout trade itself is a strategy, not the pattern.
Move size vs normal
0.97×
About the same as a normal bar.
Occurrences
473
Compression sessions in the sample.
Break direction
66.6%
Broke out within a session, split 39.7% up / 26.8% down.
Summary
Inside Day is a compression pattern: it signals a coiled range, not a direction. The move that follows is 0.97× a normal bar's range, about normal. The break splits roughly 39.7% up / 26.8% down. Trade the breakout, not a side.
Next-session outcome (direction is not predicted)
| Outcome | Count | Share |
|---|---|---|
| Broke up | 188 | 39.7% |
| Broke down | 127 | 26.8% |
| Indecisive | 158 | 33.4% |
Avg excursion above the range 0.6% · below 0.8%. The breakout trade itself is a strategy, not the pattern.
An inside day is a session whose high is below the prior session’s high and whose low is above the prior session’s low. The whole bar sits inside the previous range, a quieter session than the one before it. The market coils. There is no built-in direction, so this page treats the coil itself as the signal and asks whether a bigger move tends to follow.
How to spot it
- The session’s high is below the prior session’s high.
- The session’s low is above the prior session’s low, so the entire range sits inside the prior bar.
- The session is narrower than the one before it. That contraction is the whole pattern.
- Sessions are read off the regular trading hours, so this is a daily pattern.
Why it matters
An inside day is a coil. The widely repeated idea is that a quiet, compressed session stores energy that releases into a larger move, and that the contraction tips off the expansion before it happens. There is no direction baked in, the coil does not lean up or down, so the only honest question is whether the next move runs bigger than a normal day. That is the claim the data below tests.
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.” Because an inside day predicts no direction, we measure it both as a long and as a short and report both. The tabs below answer that on the index futures with a regular session (Nasdaq and S&P 500), on the daily chart.
For a coil, the room offered will look even on both sides, and that is exactly right. There is no directional edge here and the page does not pretend there is one. The number that matters is the expansion: how the move size after an inside day compares with a normal day. On NQ that expansion comes out close to normal. The famous notion that a coil precedes a bigger move does not hold up strongly on this market, and the page reports it straight rather than dressing it up.
How we measured it
- Entry is the close of the inside day.
- One unit of risk, 1R, is the distance from that close to the day’s own range: its low for the long side, its high for the short side.
- The direction is not predicted, so we measure both sides. The signal is the expansion, the move size against a normal day, not which way price went.
- We follow the next 20 bars and record how far price ran in multiples of that risk before the stop was hit, on each side.
- 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 and whether the move runs bigger than usual.
What this page does not cover
- An inside day that follows a strong trend bar versus one that follows chop.
- Volume on the inside day itself.
- 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 inside day bullish or bearish?
Neither. An inside day is a coil that sits entirely inside the prior session’s range, and a coil carries no direction. This page measures the room offered on both the long and the short side, and the two come out even, as they should. The real question for a compression pattern is expansion, not direction, so read the move-size number rather than looking for a lean.
Do inside days predict a bigger move?
That is the famous claim, that a coil precedes expansion. The data on this page tests it directly through the expansion number, the move size after an inside day against a normal day. On NQ that number lands close to normal, so the bigger move does not reliably arrive. Read the expansion figure on the page before assuming the coil pays off.