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CTT
View on CRAN: Click
here
Download and install CTT package within the R console
Install from CRAN:
install.packages("CTT")
Install from Github:
library("remotes")
install_github("cran/CTT") Install by package version:
library("remotes")
install_version("CTT", "2.3.3") Attach the package and use:
library("CTT")
Maintained by
John T. Willse
[Scholar Profile | Author Map]
[Scholar Profile | Author Map]
All associated links for this package
First Published: 2008-09-03
Latest Update: 2018-09-12
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.
How to cite:
John T. Willse (2008). CTT: Classical Test Theory Functions. R package version 2.3.3, https://cran.r-project.org/web/packages/CTT. Accessed 28 Aug. 2026.
Previous versions and publish date:
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Other R packages that CTT depends,
imports, suggests or enhances
Complete documentation for CTT
Functions, R codes and Examples using
the CTT R package
Some associated functions: CTT-package . CTTdata . CTTkey . cttICC . disattenuated.cor . distractor.analysis . distractorAnalysis . itemAnalysis . polyserial . reliability . score . score.transform . spearman.brown . subscales .
Some associated R codes: cttICC.R . disattenuated.cor.R . distractor.analysis.R . distractorAnalysis.R . itemAnalysis.R . polyserial.R . print.itemAnalysis.R . print.reliability.R . reliability.R . score.R . score.transform.R . spearman.brown.R . subscales.R . Full CTT package functions and examples
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