There are several major statistical tests or procedures that bear the name Tukey's test: Siegel–Tukey test, a non-parametric test used to determine if two samples have significantly different scales (variances) Tukey's B method, also called Tukey-Kramer B procedure, or Tukey's WSD (Wholly Significant Difference) Tukey–Duckworth test, a simple non-parametric test used to test whether two samples come from the same population Tukey's range test, also called Tukey method, Tukey's honest significance test, Tukey's HSD (Honestly Significant Difference) test Tukey's test of additivity, an approach used in two-way ANOVA to assess whether the factors are additively related to the expected value of the response Tukey's trend test, used to detect a monotonic trend across groups (e.g., as dosage increases, does the response consistently increase?)