Measured Progress logo and motto: It's all about student learning. Period.
K-12 Assessments: We supply standards-based assessments tailored to meet the needs of statewide-testing programs and classrooms. Professional Development: We provide professional development services that build assessment literacy and promote standards-based classrooms. Educational Resources: Supplement your educational programs with our advisory services, research, publications, and newsletter. About Us: Meet the people. Sense the passion. See the possibilities.

Louis Roussos, Ph.D.

Psychometrician

Dr. Roussos joined Measured Progress in 2006 as a senior psychometrician. In this role, he applies his extensive experience in research, programming, and teaching to perform such analysis tasks as calibration of items using item response theory, equating test forms, assisting in the setting of performance standards, and calculating the scaling of assessments.

Before joining Measured Progress, Dr. Roussos taught as an assistant professor at the University of Illinois-Champaign. As an assistant professor, adjunct professor, and teaching assistant, Dr. Roussos instructed graduate- and undergraduate-level courses related to mathematics and statistics, and has also mentored gifted high school students.

Dr. Roussos has extensive experience in computer software and programming. He is an expert in writing Fortran programs and accompanying user manuals. In addition, he has developed or assisted in the development of software for assessing model fit for skills diagnosis applications, fitting skills diagnosis models to data, calculating complex theoretical parameters for nonparametric item response theory statistics, analyzing response-time patterns in computer-based test data, DIF analysis of item response data, multidimensional test validity analysis of item response data, general-purpose hierarchical cluster analysis, proximity measure software for test validity analysis, and simulating unidimensional and multidimensional IRT data.

Dr. Roussos’s extensive research experience and interests include the development of statistical procedures for conducting and supporting skills diagnosis, including standardized testing applications, data simulation, reliability, equating, and model fit. He participates in theoretical and applied research to analyze educational and psychological tests and related constructs; bias/DIF analysis of educational and psychological tests; foundations and applications of nonparametric multidimensionality item response theory, including research on DIMTEST, DETECT, and HCA/CCPROX; cognitive psychology with an emphasis on cognitive diagnosis; classification theory with an emphasis on cluster analysis; and theoretical and applied research on computerized adaptive testing.

Dr. Roussos has conducted this research through numerous grant, contract, and consulting opportunities. In addition, Dr. Roussos has published presentation papers, journal articles, book chapters, and books, many of them currently in production. Dr. Roussos has also presented research results at more than 45 professional conferences.

Dr. Roussous holds a Ph.D. in psychology and a Master's degree in statistics from the University of Illinois at Urbana-Champaign, IL, and a Master's degree in engineering mechanics and a Bachelor's degree in mechanical engineering from Old Dominion University, Norfolk, VA.

E-mail