Louis T. Mariano

Photo of Louis Mariano
Senior Statistician; Head, Statistics Group; Professor, Pardee RAND Graduate School
Washington Office


Ph.D. in statistics, Carnegie Mellon University; M.S. in statistics, Carnegie Mellon University; B.S. in mathematics and statistics, American University


Lou Mariano is a Senior Statistician and Head of the Statistics Group at the RAND Corporation. He is also a Professor at the Pardee RAND Graduate School. His current research includes topics in both education and military manpower. Dr. Mariano's education research has focused on evaluations of the implementation and efficacy of school reform efforts; furthering the development of value-added models for estimating teacher effects; the expansion of item response theory models, with emphasis on the reduction of measurement error; and the application of quasi-experimental designs. He is currently the principal investigator of a five-year longitudinal study examining the long-term impact of student grade retention under New York City's student promotion policy. His current military manpower research includes investigation of factors impacting the diversity of Air Force personnel. Mariano holds a Ph.D. in statistics from Carnegie Mellon University.

Concurrent Non-RAND Positions

Adjunct Professor, Georgetown University Department of Mathematics and Statistics

Recent Projects

  • Evaluation of the Long-Term Effects of Retention under New York City's Student Promotion Policy
  • Analysis of Diversity for Advancement in Air Force Civilian Service
  • Evaluation of the College Bound Program
  • Evaluation of the Kauffman Scholars Program
  • Reducing Barriers to Air Force Diversity

Selected Publications

Mariano, Louis T. and Martorell, Paco, "The Academic Effects of Summer Instruction and Retention in New York City," Educational Evaluation and Policy Analysis, 35:96-117, 2013

Mariano, L.T., McCaffrey, D.F., and Lockwood, J.R., "A Model For Teacher Effects From Longitudinal Data Without Assuming Vertical Scaling," Journal of Educational and Behavioral Statistics, 35:253-279, 2010

Mariano, L.T., Kirby, S.N., Crego, A., and Setodji, C.M. "Measuring the Effect of Supportive Interventions on Proximal Student Achievement," in McCombs, J.S., Kirby, S.N., and Mariano, L.T., Ending Social Promotion Without Leaving Children Behind: The Case of New York City, RAND (MG-894-NYCDOE), 2009

Lockwood JR, McCaffrey DF, Mariano LT and Setodji C., "Bayesian Methods for Scalable Multivariate Value-Added Assessment," Journal of Educational and Behavioral Statistics, 32(2), 2007

Mariano, L.T. and Junker, B.W., "Covariates of the Rating Process in Hierarchical Models for Multiple Ratings of Test Items," Journal of Educational and Behavioral Statistics, 32(3), 2007

Davis, L.M., Mariano, L.T., Pace, J., Cotton, S., and Steinberg, P., Combating Terrorism: How Prepared are State and Local Response Organizations?RAND (MG-309-OSD), 2006

Vernez, G., Karam, R., Mariano, L.T., and DeMartini, C., Evaluating Comprehensive School Reform Models at Scale: Focus on Implementation, RAND (MG-546-EDU), 2006

Honors & Awards

  • Leonard J. Savage Award for Outstanding Doctoral Dissertation in the Application Methodology of Bayesian Statistics, The International Society for Bayesian Analysis & the American Statistical Association Section on Bayesian Statistical Science