Last data update: 2014.03.03

R: Internal RXshrink functions
RXshrink-internalR Documentation

Internal RXshrink functions

Description

These are internal functions for printing and calculating quantities such as additive K-factors and multiplicative Delta-Factors that determine a specified M extent-of-shrinkage. RXmstep() is called by RXridge(), RXtrisk() and RXtsimu().

Usage

  RXmstep(mobj, kinc, p, qp, eqm1)

Arguments

mobj

Newest objective value for the M-extent-of-shrinkage along a path of shape qp.

kinc

Previous additive eigenvalue inflation constant yielding a smaller mobj.

p

Number of elements in the regression coefficient vector.

qp

Shrinkage path Q-shape parameter.

eqm1

Vector of X'X eigenvalues raised to the power (qp-1).

Value

An output list consisting of two objects:

kinc

New, increased value of kinc that produces an M-extent-of-shrinkage = mobj.

d

A pxp diagonal matrix of multiplicative shrinkage (delta) factors for the uncorrelated components of the regression coefficient vector.

Author(s)

Bob Obenchain <wizbob@att.net>

Results