Residual-versus-fitted plot
= Residual-versus-fitted plot
A <residual-versus-fitted plot> displays residuals vertically against predicted responses horizontally. Curvature suggests an incorrect conditional-mean model; a fan-shaped spread suggests <heteroscedasticity>, while isolated large residuals may indicate unusual observations. It does not alone measure leverage or influence: <regression leverage> records unusual predictor combinations, and <Cook's distance> combines leverage and residual size.