.boundary.method: 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.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.
References
Phylogenetic Clustering Website:
http://thirteen-01.stat.iastate.edu/snoweye/phyclust/