D07-F07-A07 · LEVEL 2 GUIDED LAB · SYNTHETIC DATA

STARC Bands

How does an ATR envelope around an SMA differ from a standard-deviation band? 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

upper=SMA_n+k*ATR_m; lower=SMA_n-k*ATR_m

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.

Canonical latest output (D07-F07-A07)
{
  "center": 104.20055051999998,
  "upper": 110.647723370334,
  "lower": 97.75337766966595
}

Executable checks cover this result, flat/zero-volume boundaries, invalid timestamps, and prefix causality in both language entry points.