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Hire Dr. Yiyun C.

United States

USD 75 /hr

Statistician & Health Data Scientist, PhD | Study Design, Real-World Evidence, Clinical AI | Ex-Merck | 17+ Publications

Profile Summary

PhD-trained health data scientist with 10+ years across academic research and pharma (Merck, Agios) and 17+ peer-reviewed publications. • I HELP WITH: statistical review, study design, analysis for publication, real-world evidence, machine learning, and evaluating AI models on medical questions. • RESEARCH: HIV prevention, deep learning for chest X-rays in vaccine studies (Vaccine, 2024), infectious disease RWE. • INDUSTRY: ML for oncology targeting, clinical event prediction, forecasting, and LLM extraction from clinical notes. • INDEPENDENT AI WORK: LoRA fine-tuning, RLHF, EHR foundation models for causal inference (public code). • EDUCATION: PhD Psychological Sciences, MS Mathematical Statistics, MSPH Johns Hopkins. • Python and R.

Subject Matter Expertise

• ★ Biostatistics
• ★ Machine Learning
• ★ Deep Learning
• ☆ Statistics
• ☆ Statistical Review
• ☆ Health Data Analysis
• ☆ Social Psychology
• ☆ Python
• ☆ SQL
• ☆ SAS
• ☆ STATA
• ☆ R
• ☆ Infectious Disease
• ☆ HIV/AIDS Treatment
• ☆ Public Health
• ☆ Epidemiology
• ☆ Health Technology Assessment

Services

• Writing
• Research
• Consulting
• Data & AI

Writing Medical Writing, Technical Writing

Research User Research, Meta-Research, Feasibility Study, Fact Checking, Gap Analysis, Scientific and Technical Research, Systematic Literature Review, Secondary Data Collection

Consulting Healthcare Consulting

Data & AI Predictive Modeling, Statistical Analysis, Image Analysis, Algorithm Design-ML, Data Visualization, Big Data Analytics, Text Mining & Analytics, Data Mining, Data Cleaning, Data Processing, Data Insights

Work Experience

Merck & Co., Inc., Rahway, NJ, USA (United States)

2022 - 2026

Agios Pharmaceuticals (United States)

2021 - 2022

Merck & Co., Inc., Rahway, NJ, USA (United States)

2018 - 2021

Education

MSPH (International Health)

Johns Hopkins University

- Present

PhD (Psychological Science)

University of Connecticut

- Present

M.S. (Statistics)

University of Connecticut

- Present

Certifications

• Certification details not provided.

Publications

JOURNAL ARTICLE

Wang, Dong, Ru, Boshu, Lee, Elaine Yuen Phin, Hwang, Andy Cheuk Nam, Chan, Kate Ching-Ching, Weaver, Jessica, White, Meghan, Chen, Yiyun, Lao, Kim SJ, Khan, Tsz K, et al.(2024). Validation of a deep learning model for classification of pediatric pneumonia in Hong Kong. Vaccine. 42. (26). Microsoft.AspNetCore.Mvc.Localization.LocalizedHtmlString 126370. Elsevier

McDaniel, Lauren F, White, Melissa N, Obi, Engels N, Kohinke, Rose M, Lockhart, Ellen Rachel S, Chipriano, Damian J, Chen, Yiyun, Everson, Nathan A(2023). Clinical and economic outcomes after implementation of a fidaxomicin treatment optimization and access pathway at a US hospital system. Infectious Diseases and Therapy. 12. (1). Microsoft.AspNetCore.Mvc.Localization.LocalizedHtmlString 95--107. Springer

Chen, Yiyun, Roberts, Craig S, Ou, Wanmei, Petigara, Tanaz, Goldmacher, Gregory V, Fancourt, Nicholas, Knoll, Maria Deloria(2021). Deep learning for classification of pediatric chest radiographs by WHO’s standardized methodology. PLoS one. 16. (6). Microsoft.AspNetCore.Mvc.Localization.LocalizedHtmlString e0253239. Public Library of Science San Francisco, CA USA

Chen, Yiyun, Chen, Kun, Kalichman, Seth C(2017). Barriers to HIV medication adherence as a function of regimen simplification. Annals of Behavioral Medicine. 51. (1). Microsoft.AspNetCore.Mvc.Localization.LocalizedHtmlString 67--78. Oxford University Press

Chen, Yiyun, Li, Xiaoming, Shen, Zhiyong, Zhou, Yuejiao, Tang, Zhenzhu, Huedo-Medina, Tania B(2015). Contextual influence on condom use in commercial sex venues: A multi-level analysis among female sex workers and gatekeepers in Guangxi, China. Social science research. 52. Microsoft.AspNetCore.Mvc.Localization.LocalizedHtmlString 124--131. Elsevier

Chen, Yiyun, Li, Xiaoming, Shen, Zhiyong, Zhou, Yuejiao, Tang, Zhenzhu(2015). Drinking reasons and alcohol problems by work venue among female sex workers in Guangxi, China. Substance use & misuse. 50. (5). Microsoft.AspNetCore.Mvc.Localization.LocalizedHtmlString 642--652. Taylor \& Francis

Chen, Yiyun, Kalichman, Seth C(2015). Synergistic effects of food insecurity and drug use on medication adherence among people living with HIV infection. Journal of behavioral medicine. 38. (3). Microsoft.AspNetCore.Mvc.Localization.LocalizedHtmlString 397--406. Springer US New York

Zhang, Chen, Li, Xiaoming, Chen, Yiyun, Hong, Yan, Shan, Qiao, Liu, Wei, Zhou, Yuejiao(2014). Alcohol and other drug use, partner violence, and mental health problems among female sex workers in southwest China. Health Care for Women International. 35. (1). Microsoft.AspNetCore.Mvc.Localization.LocalizedHtmlString 60--73. Taylor \& Francis

Chen, Yiyun, Li, Xiaoming, Shen, Zhiyong, Zhou, Yuejiao, Tang, Zhenzhu(2013). Alcohol and sexual risk: An event--level analysis in commercial sex setting. Addictive Behaviors. 38. (12). Microsoft.AspNetCore.Mvc.Localization.LocalizedHtmlString 2888--2892. Elsevier

Zhang, Chen, Li, Xiaoming, Stanton, Bonita, Hong, Yan, Chen, Yiyun, Shan, Qiao, Liu, Wei, Zhou, Yuejiao(2013). Alcohol use and client-perpetrated sexual violence against female sex workers in China. Psychology, health & medicine. 18. (3). Microsoft.AspNetCore.Mvc.Localization.LocalizedHtmlString 330--342. Taylor \& Francis

Chen, Yiyun, Li, Xiaoming, Zhang, Chen, Hong, Yan, Zhou, Yuejiao, Liu, Wei(2013). Alcohol use and sexual risks: use of the Alcohol Use Disorders Identification Test (AUDIT) among female sex workers in China. Health care for women international. 34. (2). Microsoft.AspNetCore.Mvc.Localization.LocalizedHtmlString 122--138. Taylor \& Francis

Chen, Yiyun, Li, Xiaoming, Zhou, Yuejiao, Wen, Xiaoqing, Wu, Deren(2013). Perceived peer engagement in HIV-related sexual risk behaviors and self-reported risk-taking among female sex workers in Guangxi, China. AIDS care. 25. (9). Microsoft.AspNetCore.Mvc.Localization.LocalizedHtmlString 1114--1121. Taylor \& Francis

Kalichman, Seth, Pellowski, Jennifer, Chen, Yiyun(2013). Requesting help to understand medical information among people living with HIV and poor health literacy. AIDS patient care and STDs. 27. (6). Microsoft.AspNetCore.Mvc.Localization.LocalizedHtmlString 326--332. SAGE Publications Sage CA: Los Angeles, CA

Chen, Yiyun(2013). Treatment-related optimistic beliefs and risk of HIV transmission: a review of recent findings (2009-2012) in an era of treatment as prevention. Current HIV/AIDS Reports. 10. (1). Microsoft.AspNetCore.Mvc.Localization.LocalizedHtmlString 79--88. Current Science Inc. New York

Chen, Yiyun, Li, Xiaoming, Zhou, Yuejiao, Zhang, Chen, Wen, Xiaoqing, Guo, Weigui(2012). Alcohol consumption in relation to work environment and key sociodemographic characteristics among female sex workers in China. Substance use & misuse. 47. (10). Microsoft.AspNetCore.Mvc.Localization.LocalizedHtmlString 1086--1099. Taylor \& Francis

Chen, Yiyun, Latkin, Carl, Celentano, David D, Yang, Xiushi, Li, Xiaoming, Xia, Guomei, Miao, Jia, Surkan, Pamela J(2012). Delineating interpersonal communication networks: a study of the diffusion of an intervention among female entertainment workers in Shanghai, China. AIDS and Behavior. 16. (7). Microsoft.AspNetCore.Mvc.Localization.LocalizedHtmlString 2004--2014. Springer US Boston

Zhang, Chen, Li, Xiaoming, Hong, Yan, Chen, Yiyun, Liu, Wei, Zhou, Yuejiao(2012). Partner violence and HIV risk among female sex workers in China. AIDS and Behavior. 16. (4). Microsoft.AspNetCore.Mvc.Localization.LocalizedHtmlString 1020--1030. Springer US Boston

Zhang, Chen, Li, Xiaoming, Hong, Yan, Stanton, Bonita, Chen, Yiyun, Liu, Wei, Zhou, Yuejiao(2012). Pro-Alcohol-Use Social Environments and Alcohol Use among Female Sex Workers in China: Beyond the Effects of Serving Alcohol. World health & population. 13. (4). Microsoft.AspNetCore.Mvc.Localization.LocalizedHtmlString 15.

Zhang, Chen, Li, Xiaoming, Hong, Yan, Stanton, Bonita, Chen, Yiyun, Liu, Wei, Zhou, Yuejiao(2012). Pro-Alcohol-Use Social Environments and Alcohol Use among Female Sex. AIDS Care. 7. Microsoft.AspNetCore.Mvc.Localization.LocalizedHtmlString 35--47.

CONFERENCE PAPER

McDaniel, Lauren, Everson, Nathan, White, Melissa, Obi, Engels N, Chen, Yiyun, Kohinke, Rose, Lockhart, Ellen Rachel(2021). 762. Real-World Utilization of C. difficile Drug Treatments and Associated Clinical Outcomes in a US Hospital System. Open Forum Infectious Diseases. 8. (Supplement\_1). Microsoft.AspNetCore.Mvc.Localization.LocalizedHtmlString S478--S479.

Deshpande, Abhishek, Chen, Yiyun, Boye-Codjoe, Eugenia, Obi, Engels N(2021). 757. Evaluating Use of the New ICD-10 Codes for Clostridioides difficile Infection in the Premier US Hospital Discharge Database. Open Forum Infectious Diseases. 8. (Supplement\_1). Microsoft.AspNetCore.Mvc.Localization.LocalizedHtmlString S476--S476.