Chongzhi Di, PhD

Dr. Chongzhi Di is a biostatistician who collaborates with researchers who study a variety of health issues including schizophrenia, cardiovascular disease, sleep and personality, and psychiatric disorders. He has a particular interest in mobile-health tools that are being used with increasing frequency in health care and biomedical research. As a biostatistician, Dr. Di focuses on the analysis of functional and longitudinal data, statistical inference for complex models, and their application in physical activity epidemiology and other mobile-health studies. Motivated by ancillary studies of the Women’s Health Initiative, Dr. Di and his colleagues have been developing cutting-edge statistical methods for accelerometer-measured physical activity data, including novel metrics for activity intensity, frequency and duration, as well as flexible functional data analysis and compositional analysis tools for quantifying dose-response relationships between activity patterns and health outcomes. He has also been involved in other mobile-health studies that utilize mobile apps and wearable devices for improved measurement, monitoring and intervention, including smartphone-based behavior interventions and a wearable electrocardiogram monitoring patch for assessment of cardiac rhythm abnormalities.