Figure 11: Regression: RP-Power curves: 20% Vertical outliers
(a) at Y = 5 (n = 50) (b) at Y = 5 and Y = -5 (n = 100)
Figure 12: Regression: RP-Power curves: Bad leverage points:
(a) 5 points at X = (1 6),Y = 6 (n = 50); (b) 5 points at X =
(1 6), Y = 6 (n = 100)
7 Conclusion
We have studied the behaviour of the IM test when robust estimators re-
place the ML estimator in the construction of the test. Particular attention
has been given to the simplest of models, the normal location-scale model
without covariates, where the IM test with ML estimator reduces to the
24
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