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Topic starter
I have two sets of data, each fitted with a straight line via linear regression.
The slopes of the two fits are different, but how do I test to see if they are significantly different?
Posted : 13/11/2009 3:01 pm
hold them up to a light and squint
Posted : 13/11/2009 4:46 pm
Could you not trying fitting the regression line to the differences between the two data sets (difference in the the y values) assuming the x values correspond? If this line has a Beta value that is statistically different from ZERO then the two lines were different - if not then the lines are parallel and the slope is the same?
Intuitively makes sense?
Posted : 13/11/2009 4:59 pm