# Channel and the angle of its inclination using the least squares method – indicator for MetaTrader 4

A line y=**a**x+**b** can be drawn through a set of points, and the distance from each point to the line will be approximately balanced.

To plot the **HighLine** and **LowLine** lines it uses the set of High and Low points, respectively, for the MyPeriod period.

If the CalculateDeflection parameter is enabled, then two more lines – HighDeflection and LowDeflection are placed on the chart. They display the possible price variation (mean square error). The hidden line **b** shows the value of the free variable in the line equation.

The MLS-HL4-Angle indicator calculates the value of **a** in points and indicates the inclination angle of the obtained line to the horizon.

The indicator displays the value of the initial price **b** and the rate of change of angle **p** relative to the tangent. If **p**>0, then the curve **a** turns left, so the angle tends to positive values. However, if **p**<0, then the curve **a** tries to turn right and tends the angle to negative values

The MLS.zip archive contains the math of calculation using the least squares method.