: A line on a scatter plot that best defines or expresses the trend shown in the plotted points. It is chosen so that the sum of the squares of the distances from the points to the line is a minimum. It also illustrates the correlation (positive, negative, or zero (no) correlation) between the plotted variables
For a collection of points in the plane obtained from an experiment, a line that comes in some sense closest to the points Please see least squares
Single line drawn through a series of data points as a best representation of the underlying trend Can be a straight line or a curve