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Keywords:

  • Teaching;
  • Wally plot;
  • Model validation;
  • Residual plot;
  • qq-plot;
  • Sampling from the null hypothesis

Abstract

Graphical model validation techniques for linear normal models are often used to check the assumptions underlying a statistical model. We describe an approach to provide ‘instant experience’ in looking at a graphical model validation plot, so it becomes easier to validate if any of the underlying assumptions are violated.