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CTT (version 2.3.3)

Classical Test Theory Functions

Description

A collection of common test and item analyses from a classical test theory (CTT) framework. Analyses can be applied to both dichotomous and polytomous data. Functions provide reliability analyses (alpha), item statistics, disctractor analyses, disattenuated correlations, scoring routines, and empirical ICCs.

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Version

Install

install.packages('CTT')

Monthly Downloads

1,375

Version

2.3.3

License

GPL (>= 2)

Maintainer

John T Willse

Last Published

September 12th, 2018

Functions in CTT (2.3.3)

CTTdata

Example Multiple-Choice Data
itemAnalysis

Function for item reliability analysis
score

Function to score the response files
score.transform

Function for transforming scores onto different scales
spearman.brown

Functions for Spearman-Brown "Prophecy" Formula
subscales

Function to create subscales based on a design matrix
CTTkey

Example Multiple-Choice Key
disattenuated.cor

Function for disattentuated correlation
cttICC

Function for producing theoretical and empirical item characteristic curves.
distractor.analysis

Function for item distractor analysis
CTT-package

Classical Test Theory Functions
distractorAnalysis

Function for item distractor analysis
polyserial

Function for calculating polyserial correlations
reliability

Function for item reliability analysis