Table 2.

Effect size thresholds suggested by Cohen (1988) on the scale of d and the robust index ($S_{\beta }$), using the formula from Table 1 assuming equal sample proportions.

Effect size	d	S
None-small	[0, 0.2]	[0, 0.1]
Small-medium	(0.2, 0.5]	(0.1, 0.25]
Medium-large	(0.5, 0.8]	(0.25, 0.4]