irt.pars-class {plink} | R Documentation |
The formal S4 class for irt.pars. This class contains the item parameters and characteristics of the item parameters for one or more groups. When parameters are included for two or more groups, the common items between the different groups are also included.
Objects of class irt.pars
contain all the information necesary to produce
expected response probabilities, linking constants (when data for two or more groups are
included), and item/category characteristic curves.
Objects can be created by calls of the form new("irt.pars", ...)
, but this is
not encouraged. Use the function link{as.irt.pars}
instead.
pars
:cat
:poly.mod
:poly.mod
object for one group or a list of poly.mod
objects identifying the items associated with each IRT model (see class poly.mod
for more information)common
:location
:groups
:
Class "poly.mod"
, directly.
Class "list.poly"
, by class "poly.mod", distance 2.
Jonathan P. Weeks weeksjp@gmail.com