CTT-package: Classical Test Theory Functions

Description Details Author(s) References


This package can be used to perform a variety of tasks and analyses associated with classical test theory (CTT): score multiple-choice responses, perform reliability analyses, conduct item analyses, and transform scores onto different scales.


Package: CTT
Type: Package
Version: 2.1
Date: 2014-02-26
License: GPL version 2 or newer

The CTT package has the following functions: reliability, score, distractor.analysis, score.transform, spearman.brown, disattenuated.cor, subscales, polyserial.


John T. Willse <willse@uncg.edu>, Zhan Shu


Crocker, L. & Algina, J. (1986). Introduction to Classical & Modern Test Theory, New York: Harcourt Brace Jovanovich College Publishers.
Cronbach, L. J. (1951). Coefficient alpha and the internal structure of tests. Psychometika, 16, 297-334.
Gulliksen, H. (1950). Theory of Mental Tests. New York: John Wiley & Sons, Inc.
Olsson, U., Drasgow, F. & Dorans, N. J. (1982). The Polyserial Correlation Coefficient. Psychometika, 47, 337-347.

CTT documentation built on May 29, 2017, 10:44 a.m.