RankControlPhiComponent-class function

RankControlPhiComponent Class

A S4 class to store control parameters for Phi component model fitting. It is derived from class RankControl-class. class

Details

RankControlKendall is derived from virtual class RankControl. This control class tells the solver to fit a model based on a stage-wise generalization of Kendall distance. The control parameters that start with prefix EM_ are intended for the EM iteration. The ones with prefix SeachPi0 control the behaviour of searching model ranking.

Slots

• EM_limit: maximum number of EM iteration
• EM_epsilon: convergence error for weights and cluster probabilities in EM iteration
• SearchPi0_limit: maximum number of iterations in the local search of pi0.
• SearchPi0_FUN: a function object that gives a goodness of fit criterion. The default is log likelihood.
• SearchPi0_fast_traversal: a logical value. If TRUE (by default), immediately traverse to the neighbour if it is better than the current pi0. Otherwise, check all neighbours and traverse to the best one.
• SearchPi0_show_message: a logical value. If TRUE, the location of the current pi0 is shown.
• SearchPi0_neighbour: a character string specifying which type of neighbour to use in the local search. Supported values are: "Cayley" to use neighbours in terms of Cayley distance or "Kendall" to use neighbours in terms of Kendall distance. Note that Kendall neighbours are a subset of Cayley neighbours

Examples

# enabling messages
testctrl = new("RankControlPhiComponent",SearchPi0_show_message=TRUE)

See Also

RankData, RankInit, RankControl