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Indicator Formula

Technical Details — True Strength Index (TSI)

Section titled “Technical Details — True Strength Index (TSI)”

Overview

Section titled “Overview”

The True Strength Index calculation produces a bounded oscillator measuring momentum.

Mathematical Derivation

Step 1 — Calculate TSI

Section titled “Step 1 — Calculate TSI”

Purpose: Derive the True Strength Index value.

See the True Strength Index formula derivation in technical references.

Where:

  • Period parameters control lookback sensitivity

What This Measures: Momentum strength and direction

Compact Formula Summary

Refer to True Strength Index formula for compact notation.

Defaults: Long Period = 25 bars, Short Period = 13 bars

Complete Calculation Example

See the True Strength Index technical documentation for worked calculation examples.

Key Takeaways from the Example
  1. Period sensitivity: Shorter periods = more signals, longer = smoother
  2. Threshold selection: Adjust based on asset volatility
  3. Signal line: Smoothed version for crossover timing