Returns the circular standard deviation of a vector of circular data which is defined as the square root of minus 2 times the log of the mean resultant length divided by the number of observations.
a vector. The object is coerced to class
logical, indicating if
further arguments passed to or from other methods.
Computes the circular standard deviation as defined by Mardia (1972)
sqrt(-2 * ln(r))
r is the mean resultant length of the data.
Returns the circular standard deviation.
Claudio Agostinelli and Jean-Olivier Irisson
Mardia, K.V. (1972) Statistics of Directional Data. Academic Press, London, sec. 26.5, p. 617
Fisher, N.I. (1993) Statistical analysis of circular data. Cambridge University Press.
Jammalamadaka, S. Rao and SenGupta, A. (2001). Topics in Circular Statistics, Section 1.3, World Scientific Press, Singapore.
Zar, J H (2010). Biostatistical analysis. Prentice Hall. sec. 26.5, p. 617
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