= Tukey-Anscombe Plot = A '''Tukey-Anscombe plot''', more commonly known as a '''residuals vs. fitted plot''' is a visualization technique for evaluating the fit of a model. <> ---- == Description == A model can almost always be fit to a set of observations; the question remains as to whether the model is a ''good'' fit. By plotting the observed dependent variable against the model's [[Statistics/Residuals|residuals]], trends that might indicate poor fit become apparent. * A trend in the residuals, like a curve, suggests that the true relationship is not linear. * Widening or thinning of the dispersion of residuals suggests that the variance of the error term is not constant. * Outliers are clearly visualized. ---- CategoryRicottone