Estimate von Mises concentration

Estimates the von Mises concentration parameter from the mean resultant length using the standard piecewise approximation described by Fisher (1993). This is a descriptive approximation and does not apply small-sample bias corrections or uncertainty quantification.

Usage

estimate_kappa(x, axial = FALSE, na.rm = TRUE)

Arguments

x

Numeric vector of angles in radians.

axial

Should the data be treated as axial, modulo pi?

na.rm

Should missing values be removed?

Value

Estimated concentration parameter kappa.

References

Fisher, N. I. (1993). Statistical Analysis of Circular Data. Cambridge University Press.

See also

Other circular summaries: circular_mean_ci(), circular_sd(), circular_summary(), circular_variance(), mean_direction(), mean_resultant_length(), resultant_length()