Bull/bear Flag

Bull/bear Flag detects flags from measured rules rather than trendline eyeballing: a near-vertical pole built from strong closes, a brief counter-drift channel fitted to the pause by least squares, and a decisive close out of the channel in the pole's direction. It is the definitive clean build of the bull and bear flag pattern: pole height, flag depth, tilt, and bar-range contraction are all enforced before a label prints.

How to Trade the Bull/bear Flag?

• Bull Flag / Bear Flag label: the pause qualified. The pole and parallel channel draw while the pattern is live.
• Breakout triangle: the bar closes outside the flag boundary on the pole's side; a dotted line projects the measured target, pole height from the breakout.
• Diamond: the measured target was reached.
• Cross: a close beyond the far flag edge (the stop side) invalidates the pattern.

Flags are continuation trades: the pause should be passive profit-taking inside an impulse. The same logic anchors much of the chart pattern family.

Bull/bear Flag Settings

• ATR Length (default 14): the volatility unit for pole height.
• Maximum Pole Duration (default 10): longest span from pole origin to tip.
• Minimum Pole Height (ATR) (default 3): smallest qualifying impulse.
• Strong Closes (%) (default 60): share of pole bars closing in the impulsive half of their range.
• Flag Duration (default 4 to 15): fewest and most pause bars.
• Maximum Flag Depth (% of Pole) (default 50): deepest retracement allowed.
• Maximum With-Trend Tilt (% of Pole) (default 10): a channel drifting steeply with the pole is rejected.
• Require Bar-Range Contraction (default on): flag bars must average smaller ranges than pole bars.
• Volume Filter (default off): the classical contraction-then-expansion signature; bypassed without volume data.
• Style toggles (Show Pole, Channel Fill, Pattern Labels, Show Measured Target, Event Markers, all default on).

Frequently Asked Questions

What separates a flag from a pennant?

Why did a drawn flag disappear?

Is the measured target a prediction?