A Note On The Tie Problem For The Siegel-Tukey Non-Parametric Dispersion Test
Jan Vegelius · Journal of Applied Statistics · 1982
The null distribution of Siegel-Tukey's test statistic may differ from that of the Wilcoxon-Mann-Whitney if ties occur. A modification of the Siegel-Tukey test is proposed for which this is not the case. When no ties occur, this modification will equal that of the usual test.