Louis T. Mariano

Louis T. 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. Mariano's education research has focused on evaluations of the implementation and efficacy of school reform efforts; furthering the development methods for estimating teacher contributions to student learning; the expansion of item response theory models, with emphasis on the reduction of measurement error; and furthering the methodology and 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 dynamics of promotion, retention, and diversity of Air Force personnel.

Mariano holds a Ph.D. in statistics from Carnegie Mellon University.

Recent Projects

  • Evaluation of the Long-Term Effects of Retention under New York City's Student Promotion Policy
  • Impact of New Mexico's Teacher Evaluation System
  • Understanding the Impact of Guidance to Principals Regarding Formative Feedback to Teachers
  • Evaluation of the College Bound Program
  • Analysis of Diversity for Advancement in Air Force Civilian Service

Selected Publications

Le, V., Mariano, L.T., and Faxon-Mills, S., "Can College Outreach Programs Improve College Readiness? The Case of the College Bound, St. Louis Program," Research in Higher Education, 57(3), 2016

Lim, N., Mariano, L.T., Cox, A., Schulker, D., and Hanser, L., Achieving Diversity in the U.S. Air Force Officer Corps, RAND (RR-495-AF), 2014

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

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
  • Outstanding Reviewer, Journal of Educational and Behavioral Statistics (2005, 2009, 2013 and 2014), American Educational Research Association