My research interest fall into three board areas: healthcare, education, and methods development. 


Geisler, T., Ray, H.E., Ying, X. (2022). Finding the Proverbial Needle: Improving Minority Class Identification Under Extreme Class Imbalance. Journal of Classification. Under Revision. 

Zhang, L., Geisler, T., Ray, H. E., Ying, X. (2021). Improving logistic regression on the imbalanced data by a novel penalized log-likelihood function. Journal of Applied Statistics. 1 – 21.

Zhang*, L., Ray, H. E., Priestley, J., Tan, S. (2019). A Descriptive Study of Variable Discretization and Cost-Sensitive Logistic Regression on Imbalanced Credit Data. Journal of Applied Statistics, 47, 568–581.


Staples*, L. L., Morgan*, T., Yockey*, B. D., Rudd*, J. M., Nicole, H., Fontana, S. J., Ray, H. E., DeMaio,  J. (2021). Characterizing managing physicians by claims sequences in episodes of care. Journal of Biomedical Informatics. 117.

Paranjape, N., Staples*, L. L., Stradwick*, C. Y., Ray, H. E., Saldanha, I.J. (2021). Development and validation of a predictive model for critical illness in adult patients requiring hospitalization for COVID-19. PLoS ONE. 16(3): e0248891.

Rohm, C. L., Bogdan, G., Ray, H.E., Mannino, S. F., Prasad, R. (2021). Vasopressors and inotropes as predictors of mortality in acute severe cardiogenic shock treated with the Impella device. Cardiovascular Revascularization Medicine. 31, 71-75. 

Adams, Y. J., Ray, H. E. (2020). Knowledge of postpartum care and postbirth warning signs among midwives in Ghana. Birth. 47(4): 357 – 364. 

Moore, S., Rudd*, J., Ray, H. E., Estrella, E., Howard, A., Stone, A. (2020). Obstacles That Arise With a Retrospective Cohort Analysis for Cigarette Smoking and Progression to Cervical Precancer Compared to Nonsmokers. SAGE Research Methods Cases. 

Rohm, C. L., Gadidov*, B., Leitson, M. E., Ray, H. E., Prasad, R. (2019). Predictors of Mortality and Outcomes of Acute Severe Cardiogenic Shock Treated with the Impella Device. American Journal of Cardiology, 124(4), 499-504.