link-class {plink} | R Documentation |
Class "link"
Description
The formal S4 class for link. This class compiles the linking constants,
item parameter descriptive statistics, and iteration/convergence information for
the moment methods and characteristic curve methods of a separate calibration linking
procedure.
Objects from the Class
Objects can be created by calls of the form new("link", ...)
, but this is
not encouraged. Use the function link[=plink-methods{plink}
instead.
Slots
MM
:- vector for intercept and slope linking constants under the
Mean/Mean method
MS
:- vector for intercept and slope linking constants under the
Mean/Sigma method
HB
:- vector for intercept and slope linking constants under the
Haebara method
SL
:- vector for intercept and slope linking constants under the
Stocking-Lord method. The value for
SL
can also be NULL
.
descriptives
:- data.frame or list containing the item parameter
descriptive statistics
iterations
:- vector of the number of optimization iterations for
the Haebara and Stocking-Lord methods
convergence
:- character vector identifying the type of convergence
reached under the Haebara or Stocking-Lord optimizations.
(see http://netlib.bell-labs.com/cm/cs/cstr/153.pdf for more
information on the output values)
base.grp
:- numeric value indicating the base group for the calibration
include.mcm.nrm
:- logical vector indicating whether multiple-choice
model or nominal response model items were included in the computation of
the linking constants for the moment methods and characteristic curve methods
respectively.
Author(s)
Jonathan P. Weeks weeksjp@gmail.com
See Also
plink
[Package
plink version 0.1-1
Index]