Table 2.

Descriptive circular statistics for in vivo bone strain orientations recorded from anterior surface of postorbital bar.

Experiment	38	38	42	42	46	46	47	47	48
Side	Balancing	Working	Balancing	Working	Balancing	Working	Balancing	Working	Working
n	421	458	183	117	194	128	21	50	179
Mean vector (μ)	−4.373	1.316	53.386	54.524	66.968	50.119	50.596	2.307	−75.133
Length of mean vector (r)	0.904	0.97	0.998	0.997	0.974	0.945	0.999	0.974	0.835
Median	0.338	2.968	53.195	54.303	68.717	47.402	50.56	3.656	−71.58
Concentration	5.513	16.8	266.484	148.075	19.844	9.335	568.908	19.422	3.362
Circular variance	0.048	0.015	9.39E-04	0.002	0.013	0.028	4.40E-04	0.013	0.083
Circular SD	12.85	7.099	1.757	2.358	6.515	9.651	1.202	6.588	17.219
95% confidence interval (±) for μ	−3.147	1.967	53.132	54.097	66.051	48.447	50.082	0.481	−72.628
	−5.599	0.666	53.641	54.952	67.885	51.79	51.11	4.133	−77.639
99% confidence interval (±) for μ	−2.762	2.171	53.052	53.963	65.763	47.922	49.921	−0.093	−71.841
	−5.984	0.462	53.721	55.086	68.173	52.315	51.272	4.707	−78.426
Rayleigh test (Z)	344.271	430.725	182.313	116.21	184.22	114.267	20.963	47.425	124.725
Rayleigh test (P)	< 1E-12	< 1E-12	< 1E-12	< 1E-12	< 1E-12	< 1E-12	3.85E-09	< 1E-12	< 1E-12
Watson's U2 test (von Mises, U2)	3.948	1.718	0.061	0.191	2.525	1.014	0.035	0.052	0.752
Watson's U2 test (P)	< 0.005	< 0.005	0.5 > P > 0.25	< 0.005	< 0.005	< 0.005	> 0.5	0.5 > P > 0.25	< 0.005
Test for working/balancing differences
W	29.019		7.226		135.436		44.363
P	< 0.0001		0.027		< 0.0001		< 0.0001