Evaluating the Mechanism by Which the TNO Stereo Test Overestimates Stereo Thresholds

Table 2

Statistical result of the data.

Group	Shapiro–Wilk test		Wilcoxon signed-rank test
	Statistic		Versus original		Versus isoluminant		Versus grayscale		Versus black-white
			Z		Z		Z		Z
Original	0.931	0.042	—	—	−2.828	0.005	−3.251	0.001	−4.378	<0.001
Isoluminant	0.923	0.025	−2.828	0.005	—	—	−2.140	0.032	−4.226	<0.001
Grayscale	0.897	0.005	−3.251	0.001	−2.140	0.032	—	—	−3.999	<0.001
Black-white	0.802	<0.001	−4.378	<0.001	−4.226	<0.001	−3.999	<0.001	—	—