Mahalanobis distances

measure of influence

examines the distance of the case from the mean of the predictor variable

Barnett and Lewis (1978) published critical values dependent on number of predictors and sample size

even with large samples (N=500_ and 5 predictors, values above 25 are bad

N=100 values >15 bad

N=30 with 2 predictors value>11 bad

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