Process of linear regression that makes it possible to find the parameters of a line of regression by using the mean.

This method is sometimes called the double mean method. It is easier to use, but not very reliable if the distribution has any outliers.

The method consists of dividing a distribution of data into two groups of equal frequencies (or almost equal if the number of observations is odd) and then calculating a mean point for each of them. Then, we draw the line that joins these two points. This line passes through the centre of the scatter plot.