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semtree (version 0.9.12)

varimp: SEM Forest Variable Importance

Description

A function to calculate relative variable importance for selecting node splits over a semforest object.

Usage

varimp(forest, var.names = NULL, verbose = F,  
	cluster = NULL, eval.fun = evaluateTree, method = "permutation", ...)

Arguments

forest

A semforest object

var.names

Covariates used in the forest creation process. NULL value will be automatically filled in by the function.

verbose

Boolean to print messages while function is running.

method

Experimental. Some alternative methods to compute importance. Default is "permutation".

eval.fun

Default is evaluateTree function. The value of the -2LL of the leaf nodes is compared to baseline overall model.

cluster

An object of class "cluster" representing a parallel socket cluster. See package makeCluster.

Optional arguments.

References

Brandmaier, A.M., Oertzen, T. v., McArdle, J.J., & Lindenberger, U. (2013). Structural equation model trees. Psychological Methods, 18(1), 71-86.