How far does price deviate from a rolling linear trend after residual scaling? Walk the evidence clock one stage at a time. This lab teaches the publication contract; it does not simulate returns, platform parity, or trade performance.
Selected expression
fit a+b i over n; center_i=a+b i; bands=center_i +/- k*residual_stdev
Availability rule
An output at t may use only finite, basis-consistent observations available through t; chart alignment never moves the information clock backward.
calculated · step 1 of 7
Verified synthetic fixture
This lab is paired with datasets/implementation-fixtures.json: 96 deterministic, oldest-to-newest observations spanning oscillating, rising, and moderating regimes. It is teaching data—not market history or predictive evidence.