Table 4.

Descriptive circular statistics for in vivo bone strain orientations recorded from dorsal and intraorbital surfaces of supraorbital torus.

Experiment (site)	13	13	47 (roof)	47 (roof)	47 (dors orb)	47 (dors orb)
Side	Balancing	Working	Balancing	Working	Balancing	Working
n	50	52	127	153	153	107
Mean vector (μ)	1.159	5.073	9.088	−2.177	34.917	72.449
Length of mean vector (r)	0.988	0.993	0.992	0.977	0.796	0.891
Median	1.12	4.812	8.682	−3.275	36.639	75.062
Concentration	43.419	75.606	60.173	21.726	2.816	4.868
Circular variance	0.006	0.003	0.004	0.012	0.102	0.055
Circular SD	4.373	3.306	3.709	6.22	19.342	13.787
95% confidence interval (±) for μ	−0.053	4.175	8.443	−3.162	31.885	69.841
	2.372	5.972	9.733	−1.191	37.949	75.056
99% Confidence interval (±) for μ	−0.434	3.893	8.24	−3.472	30.933	69.022
	2.752	6.254	9.936	−0.882	38.902	75.875
Rayleigh test (Z)	48.848	51.312	124.889	145.956	96.987	84.879
Rayleigh test (P)	< 0.0001	< 0.0001	< 0.0001	< 0.0001	< 0.0001	< 0.0001
Watson's U2 test (von Mises, U2)	0.085	0.045	0.505	0.297	0.098	0.244
Watson's U2 test (P)	0.15 > P > 0.1	> 0.5	< 0.005	< 0.005	0.1 > P > 0.05	< 0.005
Test for working/balancing differences
W	F = 25.671		162.578		121.238
P	< 0.0001		< 0.0001		< 0.0001