scipy.stats.ansari

scipy.stats.ansari(x, y)

Perform the Ansari-Bradley test for equal scale parameters.

The Ansari-Bradley test is a non-parametric test for the equality of the scale parameter of the distributions from which two samples were drawn.

Parameters

x, yarray_like

Arrays of sample data.

Returns

statisticfloat

The Ansari-Bradley test statistic.

pvaluefloat

The p-value of the hypothesis test.

See also

fligner

A non-parametric test for the equality of k variances

mood

A non-parametric test for the equality of two scale parameters

Notes

The p-value given is exact when the sample sizes are both less than 55 and there are no ties, otherwise a normal approximation for the p-value is used.

References

1

Sprent, Peter and N.C. Smeeton. Applied nonparametric statistical methods. 3rd ed. Chapman and Hall/CRC. 2001. Section 5.8.2.