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GeneralConfusionMatrixTau Property

Gets the Tau coefficient of performance.

Namespace:  Accord.Statistics.Analysis
Assembly:  Accord.Statistics (in Accord.Statistics.dll) Version: 3.8.0
public double Tau { get; }
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Property Value

Type: Double

Tau-b statistic, unlike tau-a, makes adjustments for ties and is suitable for square tables. Values of tau-b range from −1 (100% negative association, or perfect inversion) to +1 (100% positive association, or perfect agreement). A value of zero indicates the absence of association.


  • LEVADA, Alexandre Luis Magalhães. Combinação de modelos de campos aleatórios markovianos para classificação contextual de imagens multiespectrais [online]. São Carlos : Instituto de Física de São Carlos, Universidade de São Paulo, 2010. Tese de Doutorado em Física Aplicada. Disponível em:
  • MA, Z.; REDMOND, R. L. Tau coefficients for accuracy assessment of classification of remote sensing data.

See Also