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Momentum OscillatorsPine Script v6

ta.tsi()True Strength Index

The True Strength Index uses double smoothing of price changes to measure trend direction and identify overbought/oversold conditions.

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Syntax

Syntax
ta.tsi(source, short_length, long_length) → series float

Arguments

ParameterTypeDescription
sourceseries int/floatPrice or value series (commonly close).
short_lengthsimple intFirst smoothing length for price change.
long_lengthsimple intSecond smoothing length applied after the first.

Returns

True Strength Index.

Remarks

None.

Code Examples

Pine Script v6 Example
//@version=6
indicator("ta.tsi")
plot(ta.tsi(close, 13, 25))

Trading Applications

Measure trend strength with double-smoothed momentum

Identify overbought/oversold conditions

Generate signals from signal line crossovers

Detect momentum divergences for reversal trading

Related Functions

ta.rsita.ema

Frequently Asked Questions

ta.tsi() returns the True Strength Index: double-smoothed momentum of price changes, designed to reduce noise and highlight sustained trend pressure.

TSI applies smoothing twice to the price change (conceptually EMA-style steps with short and long lengths) and normalizes, producing a centered oscillator-style output.

13/25 is a common starting point, but optimal settings vary. Test on your market and timeframe; shorter pairs react faster, longer pairs are smoother.

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