EFI Overview

Elder’s Force Index (EFI) measures the force behind price movements by multiplying price change by volume. Positive EFI = buying force (price up on volume), negative = selling force (price down on volume). The EMA smoothing period controls signal sensitivity.

EFI is unique because it directly measures the “force” of a move — a $1 advance on 10M volume produces a much stronger signal than $1 on 100K volume.

---

How Elder’s Force Index Works

Core Concept

1. Calculate EFI from price and volume data
2. Apply smoothing to reduce noise
3. Compare to zero line for direction, signal line for timing

Key Characteristics:

• Volume-Price Indicator = Combines price and volume for conviction measurement
• Zero-Line Reference = Positive = buying pressure, Negative = selling pressure
• Signal Line Available = Crossovers for timing

Visual Interpretation

EFI Behavior:

• Positive values indicate buying pressure / accumulation
• Negative values indicate selling pressure / distribution
• Zero-line crossovers signal shifts in volume trend
• Signal line crossovers provide timing signals

---

Trading Signals Available on Reversion

These are the signal names you select when configuring EFI in the algorithm builder or via the MCP agent:

Signal	Triggers When	Typical Use
efi_above_zero	EFI is positive (buying force)	Bullish force — price rising with volume
efi_below_zero	EFI is negative (selling force)	Bearish force — price falling with volume
efi_above_signalLine	EFI crosses above signal line	Buying force increasing
efi_below_signalLine	EFI crosses below signal line	Selling force increasing

Display: Separate pane

Category: Volume

Threshold range: Unbounded (centered on zero)

---

Key Characteristics

Strengths

What Elder’s Force Index Does Well:

• Volume Context: Adds volume confirmation that price-only indicators lack
• Buying/Selling Pressure: Directly measures accumulation vs distribution
• Trend Confirmation: Volume trend aligning with price trend = strong conviction

Limitations

What to Watch Out For:

• Requires Volume Data: Only works with reliable volume information
• Lagging: Smoothing introduces delay in signals
• False Signals in Low Volume: Unreliable during low-activity periods

Best Use Cases

When to Use Elder’s Force Index:

• Volume Confirmation: Confirm price breakouts with EFI direction
• Divergence Detection: Price making new highs with declining volume momentum = warning

When NOT to Use Elder’s Force Index:

• Low-Volume Assets: Unreliable volume data produces false signals
• Without Price Context: Volume indicators should confirm price signals, not replace them

---

Note

Pro Tip: Use EFI as a confirmation layer — when price breaks out and EFI confirms with a zero-line cross or signal line crossover, the move has volume conviction. Divergences (price up but EFI declining) are powerful warning signals that the move may fail.