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rpf (version 0.8)

rpf.drm: Create a dichotomous response model and associated hyperparameters.

Description

For discussion on the choice of priors see Cai, Yang, and Hansen (2011, p. 246).

Usage

rpf.drm(numChoices = 5, dimensions = 1, multidimensional,
    a.prior.sdlog = 0.5, poor = FALSE)

Arguments

numChoices
the number of choices in the question
dimensions
the number of dimensions
multidimensional
whether to use a multidimensional model. Defaults to TRUE when dimensions>1 and FALSE when dimensions==1.
a.prior.sdlog
under construction
poor
if TRUE, use the traditional parameterization of the 1d model instead of the slope-intercept parameterization

Value

  • an item model

References

Cai, L., Yang, J. S., & Hansen, M. (2011). Generalized Full-Information Item Bifactor Analysis. Psychological Methods, 16(3), 221-248.