D08-F07-A11 · LEVEL 2 GUIDED LAB · SYNTHETIC DATA

Market Meanness Index

How often does the path switch sides in a way associated with meandering behavior? 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

MMI=100*count(reversal-like crossings around rolling median)/(n-1) under the declared rule

Availability rule

A state at t may use only observations available through t; confirmed swings retain their confirmation timestamp and are never relabeled as known at the pivot bar.

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 (D08-F07-A11)
{
  "value": 10.526315789473685
}

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