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  • This topic has 2 replies, 2 voices, and was last updated 14 years ago by GJP.
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  • Calling stats whizzes – significantly different linear fits?
  • glenh
    Free Member

    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 14 years ago
    monotokpoint
    Free Member

    hold them up to a light and squint

    Posted 14 years ago
    GJP
    Free Member

    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 14 years ago
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