.boundary.method {phyclust} | R Documentation

## Boundary Methods for Population Proportions

### Description

Methods used in EM Algorithms to deal with boundary problems of population proportions, eta_k. The first element is the default value. This is a read-only object and the elemental order is followed in C.

### Usage

    .boundary.method

### Format

A character vector contains implemented boundary methods in C.

### Details

The boundary value 0 of the population proportions makes the log likelihood as -Inf. Since degeneracy of subpopulations can affect the maximizing processes in EM steps. This problem is usually caused by bad initializations, and may suggest that number of cluster K may be too large.

Two methods have been implemented when any eta_k less than the lower bound (1/N or 1e-16). The `ADJUST` (default) will adjust the eta_k to the lower bound, and the `IGNORE` will stop the iterations and return errors.

### Author(s)

Wei-Chen Chen wccsnow@gmail.com

### References

Phylogenetic Clustering Website: https://snoweye.github.io/phyclust/

### See Also

`.show.option`, `.init.procedure`, `.init.method`, `.EMControl`, `phyclust`.

### Examples

    ## Not run:
    library(phyclust, quiet = TRUE)

    .boundary.method

    ## End(Not run)

[Package phyclust version 0.1-25 Index]