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]