Rayleigh z tests for activity, peripheral temperature, and light exposure. Each circle represents 24 hours, and each triangle indicates the position of the mean acrophase of each individual in the group. The black point of the inside vector represents the mean acrophase, and the fiducial limits are also indicated. The size of the vector indicates the grouping of the acrophases. The internal circle indicates a significant level of p = 0.05.
Moraes et al. BMC Psychiatry 2013 13:77 doi:10.1186/1471-244X-13-77