Bohdana Ratitch

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Points to consider for analyzing efficacy outcomes in long‐term extension clinical trials

Bohdana Ratitch, Ilya Lipkovich, Janelle Shannon Erickson, 2018, Pharmaceutical statistics.

Bootstrapping the Learning Process for the Semi-automated Design of a Challenging Game AI

Bohdana Ratitch, Vincent Corruble, Geber Ramalho, 2004, AAAI 2004.

Characterizing Markov Decision Processes

Doina Precup, Bohdana Ratitch, Doina Precup, 2002, ECML.

Statistical Data Mining of Clinical Data

Bohdana Ratitch, Ilya Lipkovich, Cristina Ivanescu, 2020 .

6. Multiple Imputation

Bohdana Ratitch, Michael O'Kelly, 2014 .

Exploration in RL using MDP characteristics

Doina Precup, Bohdana Ratitch, Doina Precup, 2003 .

Evaluating Potential Subpopulations Using Stochastic SIDEScreen in a Cross-Over Trial

Bohdana Ratitch, Alex Dmitrienko, Ilya Lipkovich, 2019 .

Causal Inference and Estimands

Geert Molenberghs, Bohdana Ratitch, Ilya Lipkovich, 2019 .

Sparse Distributed Memories for On-Line Value-Based Reinforcement Learning

Doina Precup, Bohdana Ratitch, Doina Precup, 2004, ECML.

What's the problem with missing data?

Bohdana Ratitch, Michael O'Kelly, 2014 .

Doubly Robust Estimation

Bohdana Ratitch, Ilya Lipkovich, Michael O'Kelly, 2014 .

Missing data in clinical trials: from clinical assumptions to statistical analysis using pattern mixture models

Bohdana Ratitch, Michael O'Kelly, Robert Tosiello, 2013, Pharmaceutical statistics.

Subgroup Identification in Clinical Trials by Stochastic SIDEScreen Methods

Bohdana Ratitch, Ilya Lipkovich, Alex Dmitrienko, 2017 .

Using MDP Characteristics to Guide Exploration in Reinforcement Learning

Doina Precup, Bohdana Ratitch, Doina Precup, 2003, ECML.

Analyses under Missing‐not‐at‐random Assumptions

Bohdana Ratitch, Michael O'Kelly, 2014 .

On characteristics of markov decision processes and reinforcement learning in large domains

Bohdana Ratitch, 2005 .

Multiplicity issues in exploratory subgroup analysis

Bohdana Ratitch, Ilya Lipkovich, Alex Dmitrienko, 2018, Journal of biopharmaceutical statistics.

Implementation of Pattern-Mixture Models Using Standard SAS/STAT Procedures

Bohdana Ratitch, 2011 .

Overview of Analyses for Composite Intercurrent Event Strategies

Bohdana Ratitch, Ilya Lipkovich, Craig Mallinckrodt, 2019 .

Multi-agent patrolling with reinforcement learning

Bohdana Ratitch, Vincent Corruble, Geber Ramalho, 2004, Proceedings of the Third International Joint Conference on Autonomous Agents and Multiagent Systems, 2004. AAMAS 2004..

Statistical Issues and Recommendations for Clinical Trials Conducted During the COVID-19 Pandemic

Bohdana Ratitch, Wei Shen, Ming Zhou, 2020, Statistics in biopharmaceutical research.

Sensitivity to censored‐at‐random assumption in the analysis of time‐to‐event endpoints

Bohdana Ratitch, Ilya Lipkovich, Michael O’Kelly, 2016, Pharmaceutical statistics.

Reference-Based Imputation

Geert Molenberghs, Bohdana Ratitch, Ilya Lipkovich, 2019 .

Using principal stratification in analysis of clinical trials

Bohdana Ratitch, Yongming Qu, Ilya Lipkovich, 2021 .

Estimands, Estimators and Sensitivity Analysis in Clinical Trials

Geert Molenberghs, Bohdana Ratitch, Ilya Lipkovich, 2019 .

Causal Inference and Estimands in Clinical Trials

Bohdana Ratitch, Ilya Lipkovich, Craig H. Mallinckrodt, 2020 .

Missing Data: Turning Guidance Into Action

Geert Molenberghs, Bohdana Ratitch, Russell D. Wolfinger, 2013 .

Clinical Trials with Missing Data: A Guide for Practitioners

Bohdana Ratitch, Michael O'Kelly, B. Ratitch, 2014 .