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Regression line

In drawing a Scatter Diagram, there are a number of points which form a 'rough' line. It can be useful to plot a solid line along the 'center-line' of these points, typically so you can use the graph for some kind of estimation, or to compare it with a previous plot. 

The regression line is commonly calculated with 'the method of least squares'.

See also:

Correlation, Correlation coefficient, Correlation Table, Scatter Diagram

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