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Residual plots can be used to validate assumptions about the regression model.
Residual plots and diagnostic techniques are important tools for examining the fit of a regression model. In the case of least squares fits, plots of residuals provide a visual assessment of the ...
Patricia M. Grambsch, Terry M. Therneau, Proportional Hazards Tests and Diagnostics Based on Weighted Residuals, Biometrika, Vol. 81, No. 3 (Aug., 1994), pp. 515-526 ...