Using the Trend Strength Index for long-term investors

Using the True Strength Index (TSI) for long-term investors

What is the True Strength Index (TSI)

The True Strength Index (TSI) is a technical momentum oscillator developed by William Blau that measures the strength of price action by accounting f

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or both the magnitude and direction of price changes. The indicator is designed to assess underlying market strength and identify potential trend reversals. It distinguishes itself from other oscillators through its double-smoothing technique, which effectively reduces market noise and generates clearer signals.

How TSI works

The core of the TSI calculation lies in a process of double exponential smoothing of price changes. First, the price change between the current and previous closing prices is determined, providing the initial momentum value. These momentum values are then smoothed twice using exponential moving averages (EMA)—typically with periods of 25 and 13—to filter out short-term fluctuations and noise. The resulting TSI value oscillates between +100 and -100, with the zero line serving as the center point. Positive values indicate growing buying pressure, while negative values indicate intensifying selling pressure.

TSI for long-term investors

For long-term investors, the TSI is a valuable tool as it helps filter out short-term market noise to focus on sustainable, significant trends. The double smoothing used in its calculation makes the indicator less sensitive to sudden price spikes compared to other oscillators, increasing the reliability of signals for long-term analysis. When using TSI for long-term investing, it is recommended to apply it to higher timeframes, such as daily, weekly, or even monthly charts, to obtain more robust signals and confirm sustainable market cycles. This allows investors to make more informed decisions based on confirmed trend strength rather than temporary market moves.

Interpreting signals

Zero line crossover: This is the primary signal for determining the general direction of momentum. When the TSI rises above zero, it indicates bullish control and potential continuation of an uptrend. A drop below zero signals bearish dominance. For long-term investors, this serves as confirmation of the overall market bias.

Signal line crossover: The TSI signal line is typically a moving average of the indicator itself. A TSI crossover above its signal line suggests strengthening bullish momentum, while a crossover below indicates strengthening bearish momentum. These crossovers are more frequently used to pinpoint entry and exit points within an already established trend.

Overbought/Oversold zones: Extreme TSI values, such as above +25 (or +70) and below -25 (or -70), can indicate that an asset is overbought or oversold, respectively. While these levels may signal a potential reversal, long-term investors should use them with caution and wait for additional confirmation, as an asset can remain in these zones for an extended period during a strong trend.

Divergences: Discrepancies between price movement and the TSI are powerful signals. A bullish divergence (price making lower lows while the TSI makes higher lows) can herald a potential upward reversal. A bearish divergence (price making higher highs while the TSI makes lower highs) points to a possible downward reversal. Divergences can serve as early warning signs for long-term positions.