ellipsoid_ALS: ALS fitting of ellipsoid

In antiphon/Kdirectional: Analysis of anisotropy in point patterns using second order statistics

ALS fitting of ellipsoid

Description

Adjusted LS fitting of ellipsoids, by Kukush et al. 2003.

Usage

ellipsoid_ALS(x, s2, ..., just_U = FALSE)

Arguments

x	Point locations, n x d matrix
s2	Error variance, or a vector over which to optimize.
...	ignored
just_U	For internal use: Return just smallest eigenvector and bhat.

Details

Not really optimised yet. Good grid for s2 optimisation is something like seq(s2 * 0.1, s2, length=20) where s2 is the OLS estimate (access via $ols_fit$s2).

References

Kukush et al (2003): Consistent estimation in an implicit quadratic measurement error model, Computational Stat & Data Analysis

antiphon/Kdirectional documentation built on Feb. 13, 2023, 6:26 a.m.