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Table 6 Angular analysis of alignment during urination in male borzoi (M07)

From: Dogs are sensitive to small variations of the Earth’s magnetic field

Declination rate 0-1.7% 1.8-3.3% ≥3.4%
Number of observations 957 818 703
Mean vector (μ) 310° 285° 280°
Length of mean vector (r) 0.154 0.08 0.078
Circular standard deviation 111° 129° 130°
95% Confidence interval (-/+) for μ 294°-327° 250°-320° 241°-318°
99% Confidence interval (-/+) for μ 289°-332° 240°-331° 229°-331°
Rayleigh test (Z) 22.64 5.18 5.517
Rayleigh test (p) 1.4710-10 0.006 0.015
Rao’s spacing test (U) 345.705 344.156 341.565
Rao’s spacing test (p) < 0.01 < 0.01 < 0.01
  1. Data are sorted into three categories according to the relative changes of magnetic field declination. Limits of the categories were chosen so that sample sizes are comparable.