How direct is the window's net vertical span relative to horizontal path length? 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
VHF=(HH_n-LL_n)/sum(|C_i-C_(i-1)|,n)
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-A15)
{
"value": 0.6258523821746035
}
Executable checks cover this result, flat/zero-volume boundaries, invalid timestamps, and prefix causality in both language entry points.