Computes the specified order trigonometric moment for a set of directional data points.
Usage
trigonometric.moment(x, p=1, center=FALSE)
Arguments
x
p
order of trigonometric moment to be computed. Default is for a first order trigonometric moment.
center
logical, whether to compute centered moments or not. Default is to compute an uncentered moment.
Value
Returns a list with variables mu, rho, cos, sin, p, n, call,
respectively the pth trigonometric moment's direction, resultant length,
real and imaginary components, the order, the number of observations and
the call.
References
Jammalamadaka, S. Rao and SenGupta, A. (2001). Topics in Circular Statistics, Section 1.3, World Scientific Press, Singapore.