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Grubbs' test

We've now checked that the data are normal. Now let's apply Grubbs' outlier test!

Grubbs' test assesses whether the value that is farthest from the mean is an outlier - the value could be either the maximum or minimum value. The test is performed using the grubbs.test() function from the outliers package:

grubbs.test(x)

  • x is the input data as a numeric vector

This exercise is part of the course

Introduction to Anomaly Detection in R

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Exercise instructions

  • Run the Grubbs' test on the nitrate concentrations.

Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

# Apply Grubbs' test to the river nitrate data
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