How to Set Linear Regression on MT4 Charts
Step 1: Open the Navigator Window Panel on FX Trade Platform
Open the Navigator panel as illustrated: Navigate to "View" menu (click on it), then select & choose the "Navigator" panel window (click), or From Standard Tool Bar click "Navigator" button or press key board shortcut keys "Ctrl+N"
On Navigator panel, choose and select 'Indicators', (DoubleClick)

How to Set Linear Regression Indicator on MT4 - MT4 Linear Regression Indicator
Step 2: Expand the Indicators Menu on the Navigator - Adding Linear Regression MT4 Indicator
To make the menu bigger, click the button that looks like a plus sign, or double-click the word "indicators." Then, the button will look like a minus sign and show a list. Pick the Linear Regression chart indicator from the list to put it on the chart.

How to Add Linear Regression - From the window shown Above, you can then add the Linear Regression that you want to the chart.
How to Set Custom Linear Regression to MT4
If the indicator you as the trader want to add is a custom technical indicator - for example if the Linear Regression you want to add is a custom indicator you'll need to first add this custom Linear Regression on the MetaTrader 4 software & then compile the custom Linear Regression so that the newly added Linear Regression custom indicator pops up on the list of the custom indicators in MT4 software.
To learn and know how to install Linear Regression indicators in the MT4, how to add Linear Regression panel to MT4 and how to add Linear Regression custom indicator in MT4 Platform - How to add a custom Linear Regression in the MT4 Software.
About Linear Regression Described
Linear Regression Analysis and Linear Regression Trading Signals
A regression line is also called a line of best fit. This tool shows the trend of forex prices over a set time. It uses the "least squares fit" method to find the market trend. This approach cuts the space between price points and the best fit line.

The indicator, as opposed to the direct Regression Trendline indicator, plots the end values of various Linear Regression trendlines. The end value of a Regression Trend-Line will be equal to any single point along the Linear Regression, although the trend-line that results will look like the MA.
Unlike the MA Moving Average, however, this particular trading indicator exhibits less lag because it plots a line directly onto data points rather than calculating an average across them.
The Linear Regression is a prediction of the tomorrow's price plotted today, one day before. When prices are steadily higher or steadily lower than the forecasted price, then one can expect them to return quickly to the more realistic fore-casted levels.
In other terms, this technical technical indicator shows where the chart prices "should" be based on a statistical basis and any dis-proportionate deviation from the regression line is likely to be short lived.
Technical Analysis and How to Generate Trading Signals
This specific trading indicator permits the user to select a price level, modify the quantity of time periods under consideration, and smooth the raw pricing data prior to applying the calculation, as well as choosing the method of smoothing.
This Tool Resembles a Moving Average with Two Colors.
- Bullish Signal (Blue colour) - A rising line (higher than its previous value one previous bar before) is displayed and illustrated in the uptrend blue colour, while
- Bearish Signal (Red colour) - a falling line (lesser than its previous value one previous bar before) is illustrated & displayed in the downtrend red color.

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