# R^2 fit disagrees with residuals

• Jun 29th 2009, 01:31 AM
luysion
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?
• Jun 30th 2009, 05:43 AM
CaptainBlack
Quote:

Originally Posted by luysion
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