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CTT  

Classical Test Theory Functions
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", "2.3.4")



Attach the package and use:
library("CTT")
Maintained by
John T. Willse
[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 2.3.4, https://cran.r-project.org/web/packages/CTT. Accessed 26 Oct. 2026.
Previous versions and publish date:
1.0 (2008-09-03 07:52), 2.0 (2014-01-25 16:15), 2.1 (2014-02-25 07:44), 2.3.2 (2018-02-04 23:44), 2.3.3 (2018-09-12 14:30), 2.3 (2017-11-04 00:42), (2026-07-09 08:00)
Other packages that cited CTT R package
View CTT citation profile
Other R packages that CTT depends, imports, suggests or enhances
Complete documentation for CTT
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