A. Gregory DiRienzo, Ph.D.

Chair, Department of Epidemiology and Biostatistics
SUNY Associate Professor of Biostatistics 

Department of Epidemiology and Biostatistics                                                                                                                                                                                                                                                            Dr. DiRienzo            
Department of Epidemiology & Biostatistics
School of Public Health
One University Place
Rensselaer, NY 12144-3456

Phone:     518-402-0394
Fax:         518-402-0380  
E-mail:     gdirienzo@albany.edu    

1996:  Ph.D., Mathematics/Statistics & Biometry/Statistics, University at Albany, SUNY
1996-1998:  Postdoctoral Research Fellow, Department of Biostatistics, Harvard University  

Research Interests:  
Theory and practice of non-parametric and semi-parametric statistical methods for model selection in longitudinal studies with missing data; clinical trials; high-dimensional data; survival analysis.    

Categorical Data Analysis; Survival Analysis; Generalized Linear Models; Analysis of Rates & Proportions; Introductory Biostatistics  

Selected Publications and Presentations:  
DiRienzo AG, Lagakos SW.  “Bias Correction for Score Tests Arising from Mis-specified Proportional Hazards Regression Models,” Biometrika, 2001; 88, 421-434.  

DiRienzo AG, Lagakos SW.  “Effects of Model Misspecification on Tests of No Randomized Treatment Effect Arising from Cox's Proportional Hazards Model,” Journal of the Royal Statistical Society Series B, 2001; 63, 745-757.  

DiRienzo AG, van der Horst C,  Finkelstein D, Frame P, Bozzette S, Tashima K.  “Efficacy of Trimethoprim-Sulfamethoxazole for the prevention of bacterial infections in a randomized prophylaxis trial of patients with advanced HIV infection,” AIDS Research and Human Retroviruses, 2002; 18(2), 89-94.  

DiRienzo AG. “Nonparametric Comparison of Two Survival Time Distributions in the Presence of Dependent Censoring,” Biometrics, 2003; 59(3), 497-507.

DiRienzo AG, DeGruttola V, Larder B, Hertogs K. “Nonparametric methods to predict HIV drug susceptibility phenotype from genotype,” Statistics in Medicine, 2003; 22, 2785-2798.   

DiRienzo AG. “The Two Sample Problem for Multiple Categorical Variables,” The International Journal of Biostatistics, 2006; Vol. 2: No. 1, Article 5. http://www.bepress.com/ijb/vol2/iss1/5   Swindells S, DiRienzo AG, Wilkin T, et al.  “Regimen Simplification to Atazanavir/Ritonavir Alone as Maintenance Antiretroviral Therapy After Sustained Virologic Suppression,” Journal of the American Medical Association, 2006; Vol. 296: No. 7, 806-814.  

Riddler S,   Haubrich R,  DiRienzo AG,  et al.  “Class-sparing regimens for initial treatment of HIV-1 infection,” The New England Journal of Medicine, 2008; Vol. 358: No. 20, 2095-2106.  

Schumi J, DiRienzo AG, DeGruttola V.  “Testing for Associations with Missing High-Dimensional Categorical Covariates,” The International Journal of Biostatistics, 2008; Vol. 4: Iss. 1, Article 18. http://www.bepress.com/ijb/vol4/iss1/18  

DiRienzo AG. “Flexible Regression Model Selection for Survival Probabilites: With Application to AIDS,” Biometrics, 2008 (to appear)