soControl: Control values for order-constrained fit

Description

The values supplied in the function call replace the defaults and a list with all possible arguments is returned. The returned list is used as the control argument to the mc.est, SO.LRT, and SO.trend.test functions.

Usage

soControl(
  method = c("ISDM", "EM"),
  eps = 0.005,
  max.iter = 5000,
  max.directions = 0,
  start = ifelse(method == "ISDM", "H0", "uniform"),
  verbose = FALSE
)

Value

a list with components for each of the possible arguments.

Arguments

method: a string specifying the maximization method
eps: a numeric value giving the maximum absolute error in the log-likelihood
max.iter: an integer specifying the maximal number of iterations
max.directions: an integer giving the maximal number of directions considered at one step of the ISDM method. If zero or negative, it is set to the number of non-empty cells. A value of 1 corresponds to the VDM algorithm.
start: a string specifying the starting setup of the mixing distribution; "H0" puts weight only on constant vectors (corresponding to the null hypothesis of no change), "uniform" puts equal weight on all elements. Only a "uniform" start can be used for the "EM" algorithm.
verbose: a logical value; if TRUE details of the optimization are shown.

Author

Aniko Szabo aszabo@mcw.edu

Examples

Run this code


# decrease the maximum number iterations and
# request the "EM" algorithm
soControl(method="EM", max.iter=100)