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Math Help - R^2 fit disagrees with residuals

  1. #1
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    R^2 fit disagrees with residuals

    hey, ive plotted lets say two variables x and y and used a linear regression model to show the relationship, the R^2 is 0.6 indicating an average fit not strong

    the residual graph plotted however shows the linear model is appropriate.
    now, by looking at my scatter graph i can see dispersal of y values for larger x values. if i used a piecewise function would i be contridicting my conclusion from the residuals?
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  2. #2
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    Quote Originally Posted by luysion View Post
    hey, ive plotted lets say two variables x and y and used a linear regression model to show the relationship, the R^2 is 0.6 indicating an average fit not strong

    the residual graph plotted however shows the linear model is appropriate.
    now, by looking at my scatter graph i can see dispersal of y values for larger x values. if i used a piecewise function would i be contridicting my conclusion from the residuals?
    Try it and see if the fit is better.

    CB
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