Costas Christophi, PhD

Costas Christophi is an Assistant Research Professor in the Department of Epidemiology and Biostatistics.

• Phone: (301) 881-9260
• Fax: (301) 881-3742
• Email: costas@biostat.bsc.gwu.edu

After completing his doctoral dissertation on distances in random tries via analytic probability at The George Washington University, Professor Christophi joined the SPHHS research faculty in 2004, and now serves as a statistician on the NIH's Diabetes Prevention Program (DPP). He previously investigated the distribution of a multiplicative risk function for the Environmental Protection Agency and served as a special volunteer with the Biometry Research Group for the National Cancer Institute, researching selection bias.

A native of Cyprus, Dr. Christophi is a member of the Golden Key National Honor Society, an avid soccer player, and has a listing in Who's Who in America.

Education

Bachelor of Science (Business Administration), Boston University, 1994
Master of Science (Statistics), The George Washington University, 1999
Doctor of Philosophy (Statistics), The George Washington University, 2004

Teaching

Introduction to Business and Economic Statistics, Department of Statistics (Columbian College of Arts and Sciences)
Introduction to Statistics for Social Sciences, Department of Statistics (Columbian College of Arts and Sciences)
Business and Economic Statistics I, Department of Statistics (Columbian College of Arts and Sciences)

Research

Professor Christophi's primary research interests are clinical trials and the probabilistic analysis of algorithms. His recent statistical work with DPP has focused on gestational diabetes, the ankle-brachial index, and diabetic retinopathy.

Community Service

Professor Christophi is a member of the American Statistical Association and served as a referee for the Journal of the Iranian Statistical Society.

Departments

• Epidemiology and Biostatistics

Institutes & Centers

• Biostatistics Center

Publications

• Approximating the distribution function of risk
  Modarres R, Christophi C. Approximating the distribution function of risk. Comp Stat Data Anal 2005;49(4):1053-67.
• The oscillatory distribution of distances in random tries.
  Christophi C, Mahmoud H. The oscillatory distribution of distances in random tries. Ann Applied Prob 2005;15(2):1536-64.
• Randomization technique, allocation concealment, and susceptibility of trials to selection bias.
  Berger V, Christophi C. Randomization technique, allocation concealment, and susceptibility of trials to selection bias. J Modern Applied Stat Methods 2003;2(1):80-6.
• Series approximations in analysis of risk.
  Modarres R, Christophi C. Series approximations in analysis of risk. Comp Sci Stat 2001;33:I2001.
• Distribution of the size of random hash trees, pebbled hash trees and N-trees.
  Christophi C, Mahmoud H. Distribution of the size of random hash trees, pebbled hash trees and N-trees. Stat Prob Letters 2001;53(3):277-82.