stages_csbhc {stagedtrees}

Context-specific Backward hill-climbing

Description

Greedy search of staged event trees with iterative joining of stages.

Usage

stages_csbhc(
  object,
  score = function(x) {
     return(-BIC(x$ll))
 },
  max_iter = Inf,
  scope = NULL,
  ignore = object$name_unobserved
)

Arguments

object

an object of class sevt with fitted probabilities and data, as returned by full or sevt_fit.

score

the score function to be maximized.

max_iter

the maximum number of iterations per variable.

scope

names of variables that should be considered for the optimization.

ignore

vector of stages which will be ignored and left untouched, by default the name of the unobserved stages stored in object$name_unobserved.

Details

For each variable the algorithm tries to join stages , by adding context specific independences, and moves to the best model that increases the score. When no increase is possible it moves to the next variable.

Value

The final staged event tree obtained.

Examples

model <- stages_csbhc(full(Titanic))
summary(model)