Using the True Strength Index (TSI)

Using the True Strength Index (TSI)

The True Strength Index (TSI), developed by William Blau, is a versatile momentum oscillator that measures both the direction and strength of price action. It is designed to help traders assess underlying market strength and identify potential trend shifts by smoothing out price fluctuations to reduce market noise.

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Calculation and Smoothing

The core of the TSI is the concept of double smoothing price changes. The indicator calculates the difference between current and previous closing prices (momentum) and applies two exponential moving averages (EMA) to these values. A similar double-smoothing process is applied to the absolute values of price changes. The final TSI value is derived by dividing the double-smoothed momentum by the double-smoothed absolute momentum and multiplying the result by 100. Typical settings include 25 periods for the first smoothing and 13 periods for the second, though these parameters can be tailored to specific assets and timeframes.

Interpreting TSI Signals

The TSI oscillates around a zero line, typically ranging from -100 to +100, although most values fall within the -25 to +25 range.

Zero line crossovers: When the TSI crosses the zero line from below, it signals bullish momentum, indicating that buying pressure is dominant. A crossover from above indicates bearish momentum.

Overbought/Oversold levels: TSI values above +25 are often viewed as overbought conditions, while values below -25 are considered oversold. However, it is crucial to note that these levels are not absolute reversal signals; strong trends can keep the TSI in extreme territory for extended periods.

Divergences: Discrepancies between asset price action and TSI movement can be powerful signals for potential trend reversals. A bullish divergence occurs when the price hits lower lows while the TSI forms higher lows, suggesting a weakening of downward momentum and a possible bullish reversal. Conversely, a bearish divergence is observed when the price reaches new highs while the TSI forms lower highs, which may signal a weakening of the uptrend.

Signal Line and Crossovers

Many traders use a signal line, which is typically an exponential moving average of the TSI itself (often with a period of 7 or 9). When the TSI crosses its signal line, it generates additional trading signals. A TSI crossing above the signal line can indicate strengthening bullish momentum, while crossing below indicates intensifying bearish momentum. These crossovers can be used to refine entry and exit points.

Advantages and Limitations

The advantages of the TSI include its ability to provide smoothed signals, reducing the false positives often found in other oscillators. It effectively displays both momentum direction and strength, making it valuable for confirming trends and detecting potential reversals. The TSI is also highly versatile and can be applied across various financial markets and timeframes.

However, like any technical indicator, the TSI has its limitations. During periods of low volatility or market consolidation, it may generate frequent false signals. Furthermore, due to the double-smoothing process, the TSI can be a lagging indicator, sometimes resulting in delayed signals compared to actual price movement. Divergences, while useful, can be subjective and are not always reliable in strong trending markets.

Practical Strategies

To improve the reliability of the TSI, it is recommended to use it in conjunction with other indicators and analysis methods.