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.

A Shiny interface developed in close coordination with the CTT package, providing a GUI that guides the user through CTT analyses.

Interactive shiny application for running classical test theory (item analysis).

Visualizes results of item analysis such as item difficulty, 
    item discrimination, and coefficient alpha for ease of result communication.

Infrastructure for task views to CRAN-style repositories: Querying task views and installing the associated
             packages (client-side tools), generating HTML pages and storing task view information in the repository
	     (server-side tools).

A comprehensive set of functions designed for multivariate mean monitoring using the Critical-to-X Control Chart. These functions enable the determination of optimal control limits based on a specified in-control Average Run Length (ARL), the calculation of out-of-control ARL for a given control limit, and post-signal analysis to identify the specific variable responsible for a detected shift in the mean. This suite of tools provides robust support for precise and effective process monitoring and analysis.

Access chemical, hazard, bioactivity, and exposure data from the 
   Computational Toxicology and Exposure ('CTX') APIs 
   <https://www.epa.gov/comptox-tools/computational-toxicology-and-exposure-apis>. 
   'ctxR' was developed to streamline the process of accessing the information 
   available through the 'CTX' APIs without requiring prior knowledge of how to 
   use APIs. Most data is also available on the CompTox Chemical Dashboard 
   ('CCD') <https://comptox.epa.gov/dashboard/> and other resources found at the 
   EPA Computational Toxicology and Exposure Online Resources 
   <https://www.epa.gov/comptox-tools>.