D07-F02-A14 · LEVEL 2 GUIDED LAB · SYNTHETIC DATA

Mass Index

Is the high-low range expanding relative to its own double-smoothed baseline? 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

MI_t = sum EMA_9(H-L) / EMA_9(EMA_9(H-L)) over 25 observations

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-F02-A14)
{
  "value": 25.15692329607823
}

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