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Ondrej Blaha, PhD

Associate Research Scientist in Biostatistics

Contact Information

Ondrej Blaha, PhD

Office Location

  • 300 George Street, Fl 5, Rm 511
    New Haven, CT 06511


Dr. Blaha's research interests span around clinical trials, specifically cluster randomized, pragmatic trials with time-to-event outcomes. Currently, he has two main research topics: (1) Additive model for cluster randomized trials and (2) Exact Platform design for multi-arm, multi-stage trials.

Ondrej is currently an Associate Research Scientist at Yale Center for Analytical Sciences (YCAS). He holds a Ph.D. in Biostatistics from LSU and M.Sc. in Biostatistics from Hasselt University, Belgium. Before joining Yale University, he worked as a senior Biostatistician at Stanford University, School of Medicine.

Education & Training

  • Postdoctoral Associate
    Yale University
  • PhD
    LSU HSC, Biostatistics
  • MSc
    Hasselt University, Biostatistics
  • BC
    Charles University, General Mathematics


  • A Bayesian Prognostic Model Approach to Utilize External Controls for Single Arm Trials
    Toronto, ON, Canada 2023
    2023 Joint Statistical Meetings
  • A Bayesian Adaptive Platform Design With Continual Reassessment For Trials Utilizing Real World Data
    San Diego, CA, United States 2022
    43rd SCT Annual Meeting
  • Estimating the Impact of Patient Preference in Two-Stage Clinical Trials for Binary Outcomes When Some Patients are Indifferent to Treatment
    San Diego, CA, United States 2022
    43rd SCT Annual Meeting
  • Bayes Play the Winner for Platform Trial Design
    Chicago, IL, United States 2021
    42nd SCT Annual Meeting
  • Design and analysis of cluster randomized trials with survival outcome using the additive hazard mixed model
    Baltimore, MD, United States 2021
  • A Randomized Clinical Trial Assessing the Effects of Hypnosis vs. Standard of Care on Postoperative Opioid Use After Total Knee Arthroplasty
    Phoenix, AZ, United States 2021
    American Academy of Pain Medicine Meeting
  • Design and Analysis Considerations for Cluster Randomized Trials with a Time-to- Event Outcome
    Zoom conference during Covid-19 pandemic 2020
    2020 Joint Statistical Meetings
  • Primary Care Management of Attention-Deficit/Hyperactivity Disorder in Children Aged 2 - 5 Years
    Zoom conference during Covid-19 pandemic 2020
    Western Society for Pediatric Research,

Professional Service

Biometrical JournalReviewer2023 - Present
YCAS Biostatistics Internship ProgramDirector2022 - Present
Yale Cancer CenterAbstract Reviewer2022 - Present
ZonMwAbstract Grader 2021 - Present
Statistics in MedicineReviewer2021 - Present
Statistical Methods in Medical ResearchReviewer2021 - Present
Society for Clinical TrialsMember2019 - Present
American Statistical AssociationMember2014 - Present

Departments & Organizations