What is the significance of the Range Expansion Index in technical analysis?

When it comes to technical analysis in the stock market, traders rely on a variety of indicators to help them make informed trading decisions. One such indicator is the Range Expansion Index (REI). The Range Expansion Index is a powerful tool that measures the strength and direction of price movements.

In this blog post, we will explore the significance of the Range Expansion Index and how it can be used in technical analysis.


Understanding the Range Expansion Index

The Range Expansion Index is a technical indicator that helps traders identify periods of price expansion or contraction. It is based on the concept that during trending markets, the price tends to have larger daily trading ranges, indicating increased volatility. Conversely, during consolidating or ranging markets, the price tends to have smaller daily trading ranges, indicating decreased volatility.

Calculating the Range Expansion Index

The Range Expansion Index is calculated using the following steps:

  1. Calculate the true range (TR) for each trading period. The true range is the greatest of the following values: the difference between the high and low price, the absolute value of the difference between the high price and the previous close, and the absolute value of the difference between the low price and the previous close.
  2. Calculate the average true range (ATR) over a specified period, usually 14 periods.
  3. Calculate the range expansion (RE) as the ratio of the current true range to the average true range: RE = TR / ATR.
  4. Smooth the range expansion using a moving average to create the Range Expansion Index (REI).

Interpreting the Range Expansion Index

The Range Expansion Index provides traders with valuable insights into the strength of price movements and potential trend reversals. Here are some key interpretations of the Range Expansion Index:

1. Identifying Trend Strength

During trending markets, the Range Expansion Index tends to be higher, indicating strong price movements and increased volatility. Traders can use this information to confirm the strength of a trend and make informed trading decisions.

2. Spotting Reversal Patterns

When the Range Expansion Index reaches extreme levels, it may signal potential trend reversals. High values suggest overbought conditions and a possible trend reversal to the downside, while low values suggest oversold conditions and a potential trend reversal to the upside. Traders can use these signals in conjunction with other technical indicators to identify potential entry and exit points.

3. Confirming Breakouts and Breakdowns

The Range Expansion Index can be used to confirm breakouts and breakdowns. When a price breakout occurs accompanied by a significant increase in the Range Expansion Index, it suggests a higher probability of a sustained trend. Conversely, a breakdown accompanied by a significant increase in the Range Expansion Index confirms the strength of a breakdown.

Contact Us for Stock Market Courses


If you’re interested in expanding your knowledge of technical analysis and enhancing your trading skills, Astrobulls Research Pvt Ltd offers comprehensive stock market courses tailored to your needs. Our courses cover various topics, including technical indicators, chart patterns, risk management, and trading strategies.

To inquire about our stock market courses or to contact us for more information, please click the buttons below:



Send Inquiry


Contact Us for Stock Market Classes

If you have any questions or need further assistance, feel free to reach out to us at +91 9685990797. We arehere to support you on your journey to becoming a successful trader.




By Astrobulls Research Pvt Ltd

Leave a Comment

Your email address will not be published. Required fields are marked *