# Classical Test Theory Functions

### Description

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.

### Details

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.

### Author(s)

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

### References

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.