initDispersionParameter: Initialization of the dispersion parameter.

In cauphy: Trait Evolution on Phylogenies Using the Cauchy Process

Initialization of the dispersion parameter.

Description

Initialize the dispersion parameter.

Usage

initDispersionParameter(
  tree,
  trait,
  center,
  method.init.disp = c("Qn", "Sn", "MAD", "IQR"),
  method
)

Arguments

trait	named vector of traits at the tips.
center	the center parameter of the distribution
method.init.disp	the robust estimator method
method	the method used to fit the process. One of reml (the default), fixed.root or random.root. See Details.

Details

Constants are taken from Rousseeuw & Croux, 1993.

Value

The initial dispersion parameter.

References

Rousseeuw P.J., Croux C. 1993. Alternatives to the Median Absolute Deviation. Journal of the American Statistical Association. 88:1273–1283.

cauphy documentation built on Oct. 1, 2024, 5:08 p.m.