Trend consistency

Steadiness of recent direction, 0 (flips every bar) to 1 (never flips); on this chart it reads 1 because its input is price.

TrendConsistency takes a signed slope series and labels each bar up (above +0.0001), down (below -0.0001) or flat. Over the last window bars it counts how often that label changes, and the score is 1 minus changes divided by window minus 1. It is 1 when the direction never changes and 0 when it changes on every bar, and it ignores how large the slope is. The explainer chart feeds it the close price instead of a slope, so every bar reads up and the score stays at 1.

How to read it

The line sits in its own pane below the price, between 0 and 1.
On this chart it reads 1 on every bar after the blank start, because every close counts as up.
Changing window does not move the line here, since no bar changes direction. Only the length of the blank start changes.

What it outputs

Consistency: Share of the window where the input kept its direction, from 0 (changed on every bar) to 1 (never changed). Blank for the first window minus 1 bars.

Settings

window: Number of recent bars compared. Each direction change lowers the score by 1/(window-1), so short windows jump in big steps and window 2 gives only 0 or 1. Raising it lengthens the blank start. On this chart the line stays at 1 at any setting.

Pitfalls

The chart feeds it the close price, which always reads as up, so SPY one-minute bars give 1 on every bar (min, median and max all 1.0). The line carries no information here.
The flat band of ±0.0001 is hard-coded, not a parameter. A slope on a much smaller or larger scale can make nearly every bar flat, or nearly every bar up or down, and the score then means little.
The score ignores size: a tiny drift and a sharp rally both count as one up bar. It measures how often the direction flips, not how strong the trend is.