Provides index plots of Cook's distances, leverages (hat values), Studentized residuals, and outlier significance levels for a regression object.
Details
Roughly, in a model with n samples and p predictors (including the intercept), studentized residuals larger than 2 indicate possible outliers, hat values larger than 2*p/n indicate possible high leverage values, and Cook's distance values larger than 4/(n-p) indicate possible highly influential observations.
Acknowledgements
Uses the influenceIndexPlot function from the car package.
References
Fox, J., & Sanford, W. (2011). An R Companion to Applied Regression, Second Edition. Thousand Oaks CA: Sage.
Weisberg, S. (2014). Applied Linear Regression, Fourth Edition. Wiley.