poly.mod-class {plink} | R Documentation |
The formal S4 class for poly.mod. This class characterizes the models and associated items for a set of item parameters.
The IRT models associted with the codes:
drm
:gpcm
:grm
:mcm
:nrm
:
Objects can be created by calls of the form new("poly.mod", ...)
, but this is
not encouraged. Use the function link{as.poly.mod}
instead.
model
:drm, gpcm, grm, mcm, and nrm
. See below for more details.items
:model
, where each element
identifies the items(rows) in the corresponding set of item parameters associated
with the model(s) identified in model
.
The names of the list elements for items
must correspond to the elements in model
.
For example, if the poly.mod object is pm
and the first element in pm@model
is
drm
,one should be able to reference the associated items by pm@items$drm
. If
the list elements are unnamed, some functions may not work properly.
Jonathan P. Weeks weeksjp@gmail.com
as.poly.mod
, irt.pars
, sep.pars
,
irt.prob