convenience function

Convenience functions

These functions can be used to change some estimator options.

setestimator(x, estimator)

setoptimizer(x, optimizer = c("default", "nlminb", "ucminf",
                 "cpp_L-BFGS-B", "cpp_BFGS", "cpp_CG", "cpp_SANN",
                 "cpp_Nelder-Mead"), optim.args)

usecpp(x, use = TRUE)

Arguments

• x: A psychonetrics model.
• estimator: A string indicating the estimator to be used
• optimizer: The optimizer to be used. Can be one of "nlminb" (the default R nlminb function), "ucminf" (from the optimr package), and C++ based optimizers "cpp_L-BFGS-B", "cpp_BFGS", "cpp_CG", "cpp_SANN", and "cpp_Nelder-Mead". The C++ optimizers are faster but slightly less stable. Defaults to "nlminb".
• use: Logical indicating if C++ should be used (currently only used in FIML)
• optim.args: List of arguments to sent to the optimizer.

Returns

An object of the class psychonetrics (psychonetrics-class )

Details

The default optimizer is nlminb with the following arguments:

• eval.max=20000L
• iter.max=10000L
• trace=0L
• abs.tol=sqrt(.Machine$double.eps)
• rel.tol=sqrt(.Machine$double.eps)
• step.min=1.0
• step.max=1.0
• x.tol=1.5e-8
• xf.tol=2.2e-14

Author(s)

Sacha Epskamp