Summary
MarketFacilitationIndex is RTTA's per-bar Market Facilitation Index: the high
minus low range divided by volume. There is no rolling window or cumulative
state.
Update API
value = rtta.MarketFacilitationIndex().update(high, low, volume)
Each call is independent of prior bars. Zero volume yields a safe-divide result
of 0.
Theory Of Operation
Bill Williams' Market Facilitation Index (MFI, not to be confused with the Money Flow Index) measures how much price range is "facilitated" per unit of volume. A large range on light volume implies easy movement (high facilitation); a small range on heavy volume implies heavy facilitation resistance. Williams often pairs MFI with volume change to color-code bar types (green, fade, fake, squat); RTTA returns only the scalar MFI itself.
Recurrence
Let \(H_t, L_t, V_t\) be high, low, and volume.
No previous-bar state is retained.
Implementation Notes
The recurrence is implemented in src/rtta/indicator.cpp in
class MarketFacilitationIndex.