Narrative

My research interests are in the area of psychometrics and measurement, specifically on topics of computerized adaptive testing (CAT), equating and linking, cognitive diagnosis, and multilevel Item Response Theory (IRT) models. Currently, I am working on four topics, including (1) developing optimal item selection algorithms in cognitive diagnostic CAT and multidimensional CAT; (2) proposing semi-parametric models for jointly representing response accuracy and response times in computerized testing; (3) developing innovative psychometric models for measuring individual change/growth in longitudinal study; (4) identifying appropriate statistical indices to quantify test security and to detect cheating behaviors. Having been interns at three leading testing organizations such as CTB/McGraw-Hill, ACT and Riverside Publishing, I enjoy identifying, formulating, and solving research problems arising from real world applications in a theoretically sound way.