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Understanding the TSI Indicator: An Introduction to the True Strength Index

The True Strength Index (TSI) is a powerful momentum oscillator that enables traders to identify potential trade opportunities by measuring the strength of a trend. This unique indicator is based on double-smoothed price changes, providing a more accurate representation of momentum in its truest form [2]. In this blog post, we will delve into the world of TSI, exploring its uses, applications in trading strategies, and how it can be combined with other indicators to enhance its signals.

What is the TSI Indicator?

The TSI is a technical analysis tool that captures the ebbs and flows of price action by smoothing price changes, filtering out noise, and producing a steadier line. The calculation of TSI consists of three key components: the double smoothed price change, the double smoothed absolute price change, and the TSI formula itself. As a momentum oscillator, TSI generates trade signals based on overbought/oversold levels, crossovers, and divergences. The TSI itself consists of three parts: the TSI line, signal line, and a zero line.

How is the TSI Indicator Used?

Professional traders use the TSI indicator to gauge the strength of a trend, assisting with trade management and providing early indications of a trend continuation or reversal. The TSI oscillates between 100 and -100, with bullish and bearish trends indicated by crossings above or below the zero line, respectively. This versatile indicator can be used to hold onto winning trades, anticipate impending trend changes, and identify trend shifts through divergences.

Examples of TSI in Trading Strategies

TSI and Moving Averages:

  • A widely-used approach integrates the True Strength Index (TSI) with moving averages, such as the 50-day moving average, to substantiate the potency of a trend. For example, assume the TSI value surpasses the zero line, while concurrently, the stock price is higher than its 50-day moving average. In this case, it may suggest the onset of a promising bullish trend. On the other hand, if the TSI dips below the zero line at the same time the stock price falls below its 50-day moving average, this could signify the emergence of a bearish trend.

TSI Divergence:

  • Divergence occurs when the price and the TSI indicator move in opposite directions. For example, if the price makes a higher high, but the TSI forms a lower high, it could signal a bearish divergence, indicating a potential trend reversal. Similarly, a bullish divergence occurs when the price makes a lower low, but the TSI forms a higher low, suggesting a possible trend change.

TSI and RSI:

  • Combining the TSI with the Relative Strength Index (RSI) can help traders identify overbought or oversold conditions in the market. When both the TSI and RSI reach extreme levels, it may signal a potential reversal. For example, if the TSI is above 70 and the RSI is above 30, it could indicate overbought conditions, and a potential bearish reversal may be imminent. Divergences can also be confirmed by comparing the divergences on the TSI to the divergences on the RSI.


The True Strength Index (TSI) is an invaluable tool for traders looking to gauge the strength of a trend and identify potential trade opportunities. By understanding its uses and incorporating it into trading strategies alongside other indicators, traders can enhance their decision-making process and improve their overall trading performance.

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