CTTsub: This main function computes subscores using different methods in classical test theory (CTT)
Description
This function computes CTT subscores using methods introduced in
Haberman (2008), Haberman et al. (2009), and Sinharay (2010), which return:
(1) Original Observed subscore;
(2) The true subscore is estimated based on the observed subscore;
(3) The true subscore is estimated based on the observed total score;
(4) The true subscore is estimated based on
both the observed subscore and the observed total score.
Usage
CTTsub(test.data)
Arguments
test.data
A list that contains datasets of all subtests and the whole test,
which can be obtained using function 'data.prep'.
Value
A list of objects that include both test information and subscores:
(1) "subscore.information" - It contains test information of both subtests
and the total test, such as mean of subscores and total score, reliability, and PRMSE.
(2) "subscore.original" - It contains original subscores and total score.
(3) "subscore.RegOnSub" - It contains subscores that are estimated based on the observed subscore.
(4) "subscore.RegOnTot" -It contains subscores that are estimated based on observed total score.
(5) "subscore.RegOnTotSub" - It containss subscores that are estimated based on both observed
subscore and the observed total score.