GrubbsTest Class

public sealed class GrubbsTest : OneSampleTest

Public NotInheritable Class GrubbsTest
	Inherits OneSampleTest

public ref class GrubbsTest sealed : public OneSampleTest

[<SealedAttribute>]
type GrubbsTest = 
    class
        inherit OneSampleTest
    end

Inheritance

Object  →  HypothesisTest  →  OneSampleTest<Double>  →  OneSampleTest  →  GrubbsTest

Use the GrubbsTest class to test whether the value with greatest deviation from the mean in a sample is an outlier.

The test has two-sided and one-sided versions. In the one-sided version, the null hypothesis is that the smallest (one-tailed lower) or largest (one-tailed upper) value in the sample is not an outlier. In the two-sided version, the null hypothesis is that neither the smallest or the largest value are outliers.

This test assumes that the sample is drawn from a normal distribution. It can only test for a single outlier. If you suspect there is more than one outlier, the GeneralizedEsdTest is the test of choice.

Reference