Table 4.

Comparison of domestic and foreign standards

	The test of variance equivalence		Mean isotropic t-test
	F	Significance	t	Degree of freedom	Significance (two tail)
Differences of height
Assumed equivariance	988	0.322	0.116	140	0.908
No assumed equivariance			0.113	102.772	0.911
Differences of horizon
Assumed equivariance	0	0.997	-0.307	140	0.76
No assumed equivariance			-0.308	114.256	0.758