Classical Test Theory Functions
Function to create subscales based on a design matrix
Classical Test Theory Functions
Function for transforming scores onto different scales
Function for producing theoretical and empirical item characteristic c...
Function for disattentuated correlation
Functions for Spearman-Brown "Prophecy" Formula
Function for item distractor analysis
Function for item distractor analysis
Function for item reliability analysis
Function for calculating polyserial correlations
Function for item reliability analysis
Function to score the response files
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.