initPositionParameter function

Initialization of the position parameter.

Initialize using the trimmed mean of the trait.

initPositionParameter(trait)

Arguments

• trait: named vector of traits at the tips.

Returns

The initial position parameter.

References

Rothenberg T. J., Fisher F. M., Tilanus C. B. 1964. A Note on Estimation from a Cauchy Sample. Journal of the American Statistical Association. 59:460–463. Rousseeuw P.J., Croux C. 1993. Alternatives to the Median Absolute Deviation. Journal of the American Statistical Association. 88:1273–1283.