flexMIRT is statistical software, authored by Li Cai and commercially distributed by Vector Psychometric Group, LLC, for item analysis and test scoring. Item analysis includes the estimation of item response theory (IRT) models and diagnostic classification models, both of which are widely used in educational research and measurement. The development of ever-more complex modeling frameworks and IRT models requires an adaptable and regularly updated software program capable of keeping pace with advancements in both computing and statistical/educational measurement theory; flexMIRT seeks to fulfill this need. This entry provides a broad [Page 683]overview of the capabilities of flexMIRT and briefly details licensing information.

First released in 2012, flexMIRT was initially published as a statistical software primarily for multidimensional, multiple group, multiple-level IRT model estimation, evaluation, and scoring ...