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Use this method.
A line whose slope is not constant or not defined. A curved line, a discontinuous line, a vertical line are some examples.
A simple method involves cutting a rubber band. Then the rubber band straight line is stretched over the scatter diagram and moved about until you feel that 50 % of your data is on one side of the temporary line and the other 50 % is on the other side of the line. Often the data is grouped such that a lot of points fall on the imaginary line of the rubber band and only a few oddballs are positioned well away from the line. We think of this method as the " Best Fit " method, using your judgment to decide the best fitting trend line.
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