Table 1.

Accuracy of depth scaling relative to ideal observer model.

	Estimate	DF	t	p	r
Virtual first
Near viewing distance
PTE	−0.24	46	−1.50	0.14	0.22
Stereoscope	−0.36	62	−4.61	<0.0001	0.51
HMD	−0.48	62	−5.26	<0.0001	0.56
Far viewing distance
PTE	−0.43	46	−3.04	0.04	0.41
Stereoscope	−0.54	62	−8.36	<0.0001	0.73
HMD	−0.60	62	−7.79	<0.0001	0.70
Physical first
Near viewing distance
PTE	0.05	46	0.34	0.73	0.05
Stereoscope	−0.04	62	−0.44	0.66	0.06
HMD	−0.10	62	−1.00	0.32	0.13
Far viewing distance
PTE	0.04	46	0.30	0.76	0.04
Stereoscope	−0.18	62	−2.64	0.01	0.32
HMD	−0.27	62	−2.82	0.01	0.34

Note: Each test compares the slope of the ideal observer model to the slope of the data.