poly.mod-class: Class "poly.mod"
Description
The formal S4 class for poly.mod. This class characterizes the models and
associated items for a set of item parameters.Objects from the Class
Objects can be created by calls of the form new("poly.mod", ...), but this is
not encouraged. Use the function as.poly.mod instead.Slots
model:- character vector identifying all the models associated with the
corresponding set of item parameters. The only acceptable models are
drm, gpcm, grm, mcm, and nrm. See below for more
details. items:- list with the same length as
model, where each element
identifies the items(rows) in the corresponding set of item parameters associated
with the model(s) identified in model.
Details
The IRT models associated with the codes:
drm:- dichotomous response models (includes 1PL, 2PL, and 3PL)
gpcm:- generalized partial credit model (includes the
partial credit model)
grm:- graded response model
mcm:- multiple-choice model
nrm:- nominal response model