Williams %R
Shows the close's position inside the recent range on a negative scale.
Start with the input, not the story.
Closing location relative to the highest high and lowest low.
Plain-language formula
Platform implementations can differ in price input, smoothing, indexing and rounding. Record the exact settings and provider before comparing results.
Where it may help
Range-state research and momentum pullbacks.
Where it struggles
Strong trends, where extreme readings can persist.
Add a different measurement.
A complementary tool should answer a different question, such as volatility, regime or position risk. Test the base rule before testing the combination.
The shortcut to avoid
Treating -20 and -80 as automatic entries.
A testable next step
Test threshold entry, threshold exit and failure-swing logic separately.