A Topic Testlet Model for Calibrating Testlet Constructed Responses R package TopicTestlet version 0.1.0 Implements the Topic Testlet Model (TTM) as described by Xiong et al. (2025) <doi:10.1111/jedm.70001>. The package integrates Latent Dirichlet Allocation (LDA) with the Partial Credit Model to account for local item dependence in testlets using latent topics from student textual responses. Software Depends: R (>= 4.0.0) Imports: topicmodels, tm, stats Suggests: knitr, rmarkdown Jiawei Xiong <jiawei.xiong@uga.edu> Comprehensive R Archive Network (CRAN) Jiawei Xiong [aut, cre], Cheng Tang [ctb], Qidi Liu [ctb] GPL (>= 3) 2025-12-01 application/tgz https://CRAN.R-project.org/package=TopicTestlet doi:10.32614/CRAN.package.TopicTestlet