The formal S4 class for poly.mod. This class characterizes the models and associated items for a set of item parameters.
The IRT models associated with the codes:
dichotomous response models (includes 1PL, 2PL, and 3PL)
generalized partial credit model (includes the partial credit model)
graded response model
nominal response model
Objects can be created by calls of the form
new("poly.mod", ...), but this is
not encouraged. Use the function
character vector identifying all the models associated with the
corresponding set of item parameters. The only acceptable models are
nrm. See below for more
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
The names of the list elements for
items must correspond to the elements in
For example, if the poly.mod object is
pm and the first element in
drm,one should be able to reference the associated items by
the list elements are unnamed, some functions may not work properly.
Jonathan P. Weeks firstname.lastname@example.org
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