What Is the Least Square Moving Average?


In the vast world of trading tools, the Least Squares Moving Average offers a sophisticated way to decipher market trends. Discussing the principles of linear regression, this article takes a deep dive into how the LSMA works, how it’s calculated, and how to use it. We also compare it to a more common moving average and weigh its merits against its drawbacks.

Least Squares Moving Average Definition

The Least Squares Moving Average (LSMA) is not just another average in the world of trading. Instead, it's an advanced statistical tool that takes a unique approach to understanding price trends. The core of the LSMA lies in its aim: to provide an accurate representation of a trend by minimising the deviation between actual data points and the forecasted line.

While most traders are familiar with moving averages that simply calculate the average price over a certain number of days, such as the Simple Moving Average (SMA), the LSMA does things differently. It uses the principle of linear regression, a foundational concept in statistics. Linear regression seeks to find the "best fit" straight line on the chart. By doing so, it offers a more nuanced view of where the market has been and, importantly, where it might be heading.

This "best fit" approach makes LSMA stand out. Instead of giving equal weight to every data point, as in the SMA, LSMA focuses on fitting a line that best represents the dominant trend in a given data set. In essence, it seeks the line that produces the least amount of error when comparing it to actual prices.

Least Squares Moving Average Calculation

To grasp the calculation of the Least Squares Moving Average, understanding its foundation in linear regression is vital. Linear regression aims to find the line (or equation of the line) that best fits a dataset, and the LSMA leverages this concept for its formulation.

Here’s a breakdown of the Least Squares Moving Average equations with sums:

LSMA= Yˉ+b×(n+1)/2


- Yˉ is the average of the closing prices.

- b is the regression line’s slope.

- n is the number of periods.

Steps of Calculation:

1. Calculate the Sum of X values: Start by numbering each data point in the series, beginning from 1 to n, where n is the number of periods. Sum all these numbers, giving you the total of X values, ΣX.

2. Calculate the Sum of Y values (Yˉ): This is the sum of closing prices over n periods, ΣY.

3. Determine the Slope (b):


divided by


Where XY is the product of X and the corresponding Y value.

4. With Yˉ and b determined, plug these values into the LSMA equation to get the value of the LSMA for a particular period.

Fortunately, you don’t need to calculate the indicator yourself. In FXOpen’s free TickTrader platform, you can add the LSMA to your chart and get started in minutes.

By leveraging the Least Squares Moving Average equations, traders can gain a more refined insight into an asset’s price movements, identifying the best-fit line through the closing prices of the chosen period. This advanced technique helps in filtering out noise and emphasising the dominant market trend.

Difference Between the LSMA and SMA

At their core, both the LSMA and SMA aim to smooth out price data to decipher underlying market trends. However, their methodologies and implications for traders are quite distinct.

Method of Calculation

SMA is more straightforward. It adds up the closing prices for a specified number of periods and then divides this total by that number of periods. LSMA, on the other hand, leverages linear regression, determining the line that offers the least squared difference from the actual prices.

Sensitivity to Price Changes

SMA gives equal importance to all closing prices within the specified period. Consequently, sudden price movements can significantly influence the SMA. The LSMA, due to its regression-based approach, tends to be less reactive to sudden, isolated price spikes or dips, as it focuses on the overall trend direction.

Lagging Nature

All moving averages lag behind the current price to some degree. However, due to the averaging process, SMA often has more lag, especially for longer periods. The LSMA, by considering the trend direction, often results in a line that is slightly ahead, reducing the lag.

How to Use the Least Square Moving Average

When trying to find a moving average, the Least Squares has consistently proven itself a promising solution. While its calculation may be rooted in complex statistics, its application in trading can be direct and powerful. Let’s take a look at some ways in which traders leverage the LSMA.

Trend Following/Identification

The LSMA's unique structure allows it to closely follow the market’s trend. When the LSMA is ascending, it often indicates an upward trend. Conversely, a descending LSMA can be a sign of a downward trend. This is especially true when the price is above or below the line; for example, an upward-sloping line with the price above the LSMA signifies strong bullishness.

Moving Average Crossovers

A common strategy involves using two LSMAs: one short-term and one long-term. When the short-term LSMA crosses above the long-term LSMA, it's typically seen as a bullish signal. Conversely, when the short-term LSMA crosses below, it can be interpreted as bearish. This method helps in confirming the trend's strength and can be used to identify potential entry or exit points.

Dynamic Support and Resistance Levels

The LSMA can also function as dynamic support and resistance levels. If the price stays above the LSMA, the moving average can act as a line of support. When prices fall below the LSMA, it can act as a resistance level. These dynamic levels adjust with the market's movements, offering traders evolving reference points to consider when making entries or exits.

Pairing with Other Indicators

Incorporating the LSMA with other technical tools can amplify its effectiveness. For instance, using it alongside oscillators like the Relative Strength Index (RSI) or the Moving Average Convergence Divergence (MACD) can help identify overbought or oversold conditions. Additionally, combining it with volume-based indicators can provide insights into the strength behind a particular price movement or trend. This multi-indicator approach can lead to more accurate trading signals.

Pros and Cons of the LSMA

The Least Squares Moving Average, like any other tool in trading, has its strengths and limitations. Here's a balanced look at its advantages and drawbacks:


  • Better Trend Representation: By focusing on the best-fit line through a dataset, the LSMA often provides a more accurate depiction of the underlying trend compared to traditional moving averages.
  • Reduced Lag: LSMA, because of its regression-based approach, tends to lead the price data slightly, thereby offering a timely signal compared to other moving averages.
  • Dynamic Support/Resistance: Its ability to act as a fluid support or resistance level offers traders evolving points of interest, which can be invaluable in volatile markets.


  • Complex Calculation: Its foundation in linear regression can make it more challenging to compute, especially for traders new to the concept.
  • Not an Oscillator: In its default form, traders can’t use the Least Squares Moving Average as an oscillator. This limitation means that traders may not be able to gauge overbought or oversold conditions using the LSMA alone, necessitating the use of additional tools for such insights.
  • Potential for False Signals: Like all moving averages, the LSMA can still produce false signals, especially in sideways or ranging markets.

The Bottom Line

In summary, the LSMA is one of the most interesting types of moving averages, highlighting the intersection of statistics and trading. Its “best fit” approach gives it a significant advantage over its lagging counterparts, and it’s worth experimenting to see if it could enhance your trading process. Once you feel ready to put your LSMA strategy to work, you can open an FXOpen account and benefit from low-cost trading and lightning-fast executions. Good luck!

This article represents the opinion of the Companies operating under the FXOpen brand only. It is not to be construed as an offer, solicitation, or recommendation with respect to products and services provided by the Companies operating under the FXOpen brand, nor is it to be considered financial advice.

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