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PhD: Computer Science and Engineering, State University of New York at Buffalo

Research Interests: By positioning data at the core of my research studies, data science, data mining, data modeling, data communications, data compression, data presentation, data retrieval, data indexing, data querying, and data fusion have been different aspects of my data science research. I have performed research on protein crystallization analysis, bioinformatics/biochemistry, data mining, machine learning, computer vision, image & video processing, information retrieval, spatio-temporal indexing & querying, multimedia synchronization, and multimedia databases. I have published or presented over 100 refereed international journal/conference/workshop papers and book chapters in various aspects of data science.

Selected Publications:

T. X. Tran and R. S. Aygun, 鈥淲isdomNet: trustable machine learning toward error-free classification,鈥� Neural Comput. Appl., Jul. 2020, .

T. X. Tran, M. L. Pusey, and R. S. Aygun, 鈥�,鈥� J. Fluoresc., vol. 30, pp. 637鈥�656, 2020.

M. Shrestha, T. X. Tran, B. Bhattarai, M. L. Pusey, and R. S. Aygun, 鈥�,鈥� IEEE/ACM Trans. Comput. Biol. Bioinform., 2019.

K. M. Paramkusem and R. S. Aygun, 鈥�,鈥� Ann. Data Sci., vol. 5, no. 3, pp. 359鈥�386, 2018.

R. Aygun and W. Benesova, 鈥淢ultimedia Retrieval that Works,鈥� in 2018 IEEE Conference on Multimedia Information Processing and Retrieval (MIPR), Apr. 2018, pp. 63鈥�68, .

N. Henderson and R. Aygun, 鈥淗uman Action Classification Using Temporal Slicing for Deep Convolutional Neural Networks,鈥� in 2017 IEEE International Symposium on Multimedia (ISM), Dec. 2017, pp. 83鈥�90, .

S. Dinc, F. Fahimi, and R. Aygun, 鈥�,鈥� Robotica, pp. 1鈥�19, 2017.

M. L. Pusey and R. S. Ayg眉n, . Springer International Publishing, 2017.

T. Tuna et al., 鈥淯ser characterization for online social networks,鈥� Soc. Netw. Anal. Min., vol. 6, no. 1, p. 104, Dec. 2016, .

M. S. Sigdel, M. Sigdel, S. Din莽, I. Dinc, M. L. Pusey, and R. S. Ayg眉n, 鈥淔ocusALL: Focal Stacking of Microscopic Images Using Modified Harris Corner Response Measure,鈥� IEEE/ACM Trans. Comput. Biol. Bioinform., vol. 13, no. 2, pp. 326鈥�340, Mar. 2016, .

PhD: Sociology and Social Policy, Newcastle University (UK)

Research Interests: I use quantitative and qualitative research methods to study the impacts of policies and practices on children, families, and professionals. This has included studies of family mediators, parenting coordinators, refugee adolescent identity, intercultural parenting practices, and a wide variety of program evaluation research. More recently I have been interested in the social implications of data science and analytics, especially work-related stress and burnout among technology workers

Selected publications: 

Wood, B., Guimaraes, A.B., Holm, C.E., Hayes S. W., & Brooks, K.R. (2020). Academic Librarian Burnout: A Survey Using the Copenhagen Burnout Inventory (CBI). Journal of Library Administration, 60(5), 512-531

Hayes, S. (2020). Cautionary Ethics Tales: Phrenology, Eugenics...and Data Science? In B. Franks (Ed.) 97 Things About Ethics Everyone in Data Science Should Know. (p. 9-12). Sebastopol, CA, O鈥橰eilly Media. ISBN: 9781492072638, 149207263X

Hayes, S. W., & Endale, E. (2018). Sometimes my mind, it has to analyze two things: Identity development and adaptation for refugee and newcomer adolescents. Peace and Conflict: Journal of Peace Psychology, 24(3), 283-290.

Hayes, S. (2017). Changing radicalization to resilience by understanding marginalization. Peace Review: A Journal of Social Justice, 29(2), 153-159. 

Hayes, S., Grady, M., & Brantley, H. (2012). Emails, Statutes, & Personality Disorders: A survey of the processes, interventions, and perspectives of parenting coordinators. Family Court Review, 50(3), 429-440.  

Hayes, S. (2010). More of a street cop than a detective: An analysis of the roles and functions of parenting coordinators in North Carolina. Family Court Review, 48 (4), 698-709. 

PhD: Epidemiology, Emory University

Research Interests: While I am a part-time assistant professor, I am also a full-time epidemiologist at the Centers for Disease Control and Prevention (CDC). At CDC, I lead a time of analysts primarily conducting research in antibiotic resistance, antibiotic stewardship, and healthcare associated infections. My studies typically use large electronic health care and administrative data to look at important questions using methods in epidemiology and incorporating newer methods related to data science.

Selected Publications:

John A Jernigan, Kelly M Hatfield, Hannah Wolford, Richard E Nelson, Babatunde Olubajo, Sujan C Reddy, Natalie McCarthy, Prabasaj Paul, L Clifford McDonald, Alex Kallen, Anthony Fiore, Michael Craig, James Baggs. Multidrug-resistant bacterial infections in US hospitalized patients, 2012鈥�2017. N Engl J Med, 382(14), 1309-1319. 

James Baggs, Scott K Fridkin, Lori A Pollack, Arjun Srinivasan, John A Jernigan. Estimating national trends in inpatient antibiotic use among US hospitals from 2006 to 2012, JAMA Internal Medicine, 176(11), 1639-1648.

James Baggs, Julianne Gee, Edwin Lewis, Gabrielle Fowler, Patti Benson, Tracy Lieu, Allison Naleway, Nicola P Klein, Roger Baxter, Edward Belongia, Jason Glanz, Simon J Hambidge, Steven J Jacobsen, Lisa Jackson, Jim Nordin, Eric Weintraub. The Vaccine Safety Datalink: a model for monitoring immunization safety, Pediatrics, 127(S1), S45-S53.

James Baggs, John A Jernigan, Alison Laufer Halpin, Lauren Epstein, Kelly M Hatfield, L Clifford McDonald. Risk of subsequent sepsis within 90 days after a hospital stay by type of antibiotic exposure, Clinical Infectious Diseases, 66(7), 1004-1012.

Eric S Weintraub, James Baggs, Jonathan Duffy, Claudia Vellozzi, Edward A Belongia, Stephanie Irving, Nicola P Klein, Jason M Glanz, Steven J Jacobsen, Allison Naleway, Lisa A Jackson, Frank DeStefano. Risk of intussusception after monovalent rotavirus vaccination, N Engl J Med, 370(6),513-519.

Athena P Kourtis, Kelly Hatfield, James Baggs, Yi Mu, Isaac See, Erin Epson, Joelle Nadle, Marion A Kainer, Ghinwa Dumyati, Susan Petit, Susan M Ray, Emerging Infections Program MRSA, David Ham, Catherine Capers, Heather Ewing, Nicole Coffin, L Clifford McDonald, John Jernigan, Denise Cardo. Vital Signs: Epidemiology and Recent Trends in Methicillin-Resistant and in Methicillin-Susceptible Staphylococcus aureus Bloodstream Infections 鈥� United States, MMWR Morb Mortal Wkly Rep, 68(9), 214-219.

PhD: Applied Statistics & Research Methods, University of Northern Colorado

Research Interests: Dr. Austin Brown's research interests are primarily focused on process improvement, including both solving applied problems as well as developing novel control charting techniques (with specific interest in nonparametric methods) and statistics in sports. He has published and presented work at national and international conferences in both areas. Process improvement includes a variety of statistical methods which can be used to evaluate, inform, and control a process. While process improvement is traditionally thought of in manufacturing settings, it can be applied in nearly any area that has measurable inputs and outputs, including education, medicine, and economics. One tool which can be used in process improvement applications is the control chart, which is a graphical and statistical tool used to identify whether a characteristic of a process has substantially changed from the desired value. As the variety of areas of application for process improvement grows, so to does the need for control charts designed for the specific aspects of the processes being monitored. Statistics in sports is also a broad field with lots of areas of application including sport management, performance prediction, injury management, betting strategies, fantasy sports strategies, among many, many other areas.

Selected Publications:

Situational Awareness in Acute Patient Deterioration: Identifying Student Time to Task.

The alternative distribution of the non parametric extended median test CUSUM chart for multiple stream processes

A nonparametric CUSUM control chart for multiple stream processes based on a modified extended median test

Outlook in life of older adults and their health and community condition

The effect of a repeat septic shock simulation on the knowledge and skill performance of undergraduate nursing students 

Motivation and Postsecondary Enrollment Among High School Students Whose Parents Did Not Go to College

PhD: Mathematics, Emory University

Research Interests: My expertise lies in the fields of Graph Theory and Combinatorics. These areas are rich with opportunity for both theoretical and applied research. On the theoretical side, one theme in my research is the use of graphs to realize combinatorial identities. Sometimes these were new identities and at other times, the method of proof was extremely novel. On the application side, lives the theme of routing (and other optimization) problems in graphs and networks. These range from the recreational such as the closed knight鈥檚 tour on a chessboard to the serious when decreasing travel times to incidents for the Cobb County Fire Department. While I have published some of my 25+ journal and proceedings papers as the sole author, I strive to include students in my research (and hence on the publications as well). Hence, most of my scholarly output has included students.

Selected Publications:

Zhang, l., Priestley, J., DeMaio, J., Ni, S., Tian, X., , Big Data, 2020

DeMaio, J., Alum, M., , SAS Global Forum Conference Proceedings, 2020

Rudd, J.M., Henshaw, A.M., Staples, L., Akkineni, S., Li, L., DeMaio, J., 

DeMaio, J., Yockey, B., , 2019 SAS Global Forum Conference Proceedings

DeMaio, J., Henshaw, A., Staples, L., , Proceedings from Southeast SAS Users Group 2018

Venn, A., DeMaio, J., , Southeast SAS Users Group

DeMaio, J., , Southeast SAS庐 Users Group (SESUG) Conference

DeMaio, J., Jacobson, J.,  (EJGTA) 2 (2), 129-138

Hillen, A., DeMaio, J., 鈥�, MatheMatics teaching in the Middle school 19 (6), 392-392

DeMaio, J., Bindia, M., Which Chessboards have a Closed Knight's Tour within the Rectangular Prism?, Electronic Journal of Combinatorics 18, P8

PhD: Biostatistics, University of Louisville

Research Interests: Dr. Ferguson uses her training in biostatistics to conduct research medical research.  Her early research focused on developing methods for estimating nonparametric multistate models for truncated and censored data and applying new and existing methods to real medical data.  Her research is now focused on preterm infant growth and clinical epidemiology.

Grants:

Ferguson, A. N. (Principal), Olsen, I. E. (Supporting), Grabich, S., Grant, "Determining what values in growth curves best classify small and large-for-gestational age in preterm infants to predict morbidity and mortality", Sponsored by Gerber Foundation, Private, $334,233.00, Funded. (January 1, 2020 - June 2025). 

Selected Publications:

Ferguson, A.N., Granger, M., Olsen, I. E., Clark, R. H., Woo, J. G. (2024).  Mortality Risk in US Neonatal Intensive Care Unit Infants by Birth Size Classifications Comparing Three Growth Curves.  Neonatology.

Jordan, N., Ferguson, A.N., Gittner, K., Woo, J.G., Clark, R.H. (2023). Visualizing Chronic Lung Disease Incidence in SAS; An Educational Journey to Data Visualization, SouthEast SAS User Group 2023 Conference Proceedings.

Olsen, I.E., Granger, M., Masoud, W., Clark, R.H., and Ferguson, A.N. (2023). Defining Body Mass Index Using Weight and Length for Gestational Age in the Growth Assessment of Preterm Infants at Birth. American Journal of Perinatology.

Ferguson, A.N., Olsen, I.E., Clark, R.H., Yockey, B.D., Boardman, J., Biron, K., Jannuzzo, C., Waskiewicz, D., Mendoza, A., Lawson, M.L., Hum, A.,  Differential classification of infants in United States neonatal intensive care units for weight, length, and head circumference by United States and international growth curves (2020), Biol.  Sep;47(6):564-571. . Epub 2020 Sep 18.

Ferguson A.N., Grabich S.C., Olsen I.E., Cantrell R., Clark R.H., Ballew W.N., Chou J., Lawson M.L., BMI is a better body proportionality measure than the ponderal index and weight-for-length for preterm infants (2018), Neonatology; 113:108鈥�116. 

Marvin, M.R., Ferguson, N., Cannon, R.M., Jones, C.M., Brock, G.N., MELDEQ: An alternative Model for End鈥怱tage Liver Disease score for patients with hepatocellular carcinoma (2015), Liver Transpl. May;21(5):612-22. . Epub 2015 Apr 15.

Olsen, I.E., Lawson, M.L., Ferguson, A.N., Cantrell, R., Grabich, S.C., Zemel, B.S., Clark, R.H., BMI curves for preterm infants (2015), Pediatrics. Mar;135(3):e572-81. . Epub 2015 Feb 16.

Ferguson, N., Datta, S., Brock, G., msSurv: An R package for nonparametric estimation of multistate models (2012), Journal of Statistical Software September 2012, Volume 50, Issue 14.  

PhD: Mathematics Teaching and Learning, Georgia State University

Research Interest: Dr. Kimberly Gardner is interested in Statistics Education research. She currently conducts research on the interdisciplinary nature of secondary mathematics and science teachers鈥� pedagogical content knowledge for teaching statistics, and the application of statistics as a practical theory of inquiry in integrated science, technology, engineering and mathematics (STEM) content. Her investigations contribute to identifying research-based professional development models for teachers鈥� integrated STEM education training. In her work to improve undergraduate students鈥� STEM education and experiences, Dr. Gardner investigates the impact of interventions for teaching and learning focused on increasing teaching effectiveness and on fostering quality learning environments for all students.

Selected Publications:

Gardner, K. D., Worthy, R., Glassmeyer, D. M. (2020). An Integrated STEM Professional Development Initiative for Connecting Environmental Education Across Middle and Secondary Mathematics. In Schroth, T., & Daniels, J. (Eds.), Handbook of Research on Building STEM Skills Through Environmental Education. Hershey, PA: IGI Global.

Glassmeyer, D. M., Smith, A., Gardner, K. D. (2020). Developing Teacher Content Knowledge by Integrating pH and Logarithms Concepts. School Science and Mathematics, vol. 120, pp.165-174. 

Gardner, K., Glassmeyer, D., Worthy, R. (2019). Impacts of STEM Professional Development on Teachers' Knowledge, Self-Efficacy, and Practice. Frontiers in Education (4). 

Clarke, D., Str酶mskag, H., Johnson, H. L., Bikner - Ahsbahs, A., Gardner, K. D. (2014). . In Liljedahl,P, Nicol, D., & Allan, D. (Ed.), Proceedings of the 38th Conference of the International Group for the Psychology of Mathematics Education (38th ed., vol. 1, pp. 30). 

Gardner, K. D. (2013). 黑料网ing the phenomenographic approach to students鈥� conceptions of tasks. Proceedings of the International Commission on Mathematics Instruction Study 22: Task Design in Mathematics Education (1st ed., vol. 22, pp. 195-204). Oxford, England.

Gardner, K. D. (2013). A data generating review that bops, twists and pulls at misconceptions. Teaching Statistics/Blackwell Publishing, 35(1), 8-13,

Gardner, K., Edenfield, K., Sanchez, W., Lischka, A., Rimpola, R. & Gammill, R.  (2011).  State Conference Presenters鈥� Conceptions of Reform in Mathematics. Proceedings of the 33nd annual meeting of the North American Chapter of the International Group for the Psychology of Mathematics Education (pp.1286 鈥� 1294).  Reno, NV.

Gardner, K. (2010).  Investigating Secondary Students' Experiences of Statistics.  In Brosnan, P., Erchick, D. B., & Flevares, L. (Eds.).  Proceedings of the 32nd annual meeting of the North American Chapter of the International Group for the Psychology of Mathematics Education: Optimizing Student Understanding in Mathematics Columbus, OH (678 鈥� 684): The Ohio State University.

Gardner, K. (2010).  A Qualitative Framework for Evaluating Learning Outcomes. In Copeland, S. (Editor). Proceedings of the 40th annual meeting of the International Society of Exploring Teaching and Learning (ISETL).

Thomas, C., Williams, D., & Gardner, K.  (2008). Performance-based mathematics instruction: An investigation of urban school mathematics teachers鈥� knowledge.  Proceedings of the 10th International Conference on Education. Education Research Unit of the Athens Institute for Education and Research. Athens, Greece.

Thomas, C., Williams, D., & Gardner, K. (2007). An examination of teacher-designed mathematical tasks for urban learners. In Lamberg, T & Wiest, L. (Eds.), (vol. 29). Proceedings of the 29th annual meeting of the North American Chapter of the International Group for the Psychology of Mathematics Education. Lake Tahoe, Nevada: North American Chapter of the International Group for the Psychology of Mathematics Education.

Thomas, C., Williams, D., Gardner, K. (2007). Designing performance-based mathematics tasks for urban learners. Proceedings of the 5th Annual Hawaii International Conference on Education. Honolulu, HI.

PhD: Applied Statistics and Research Methods, University of Northern Colorado

Research Interests: I have a passion for survey methods and latent variable analyses. I often seek out unique ways to incorporate secondary methodological hypotheses within primary research objectives. I have served as the primary statistician and methodologist on various public health research teams and enjoy a collaborative environment.

Selected Publications: 

Matheny, L. M., Gittner, K., Harding, J., & Clanton, T. O. (2021). . Knee Surgery, Sports Traumatology, Arthroscopy, 29, 1276-1283.

Matheny, L., Clanton, T., Gittner, K., & Harding, J. (2018). . Foot & Ankle Orthopaedics, 3(2), 2473011418S00011.

Gittner, L. S., & Gittner, K. B. (2017). . Eating behaviors, 26, 133-136.

PhD: Environmental Engineering, Vanderbilt University

Research Interests: My research aims to integrate statistical, economic, and agent-based modeling to analyze decision-making under uncertainty in risk-related applications. In particular, my research focuses on quantifying resilience to natural hazards, past and projected, and using Bayesian approaches to better assess investments in climate change adaptation and mitigation.

Publications:

Johnson, Paul M.; Baroud, Hiba; Philip, Craig; Abkowitz, Mark. (2022). The Engineering Economist

Johnson, Paul M.; Barbour, William; Camp, Janey V.; Baroud, Hiba. (2022). Transportation Research Interdisciplinary Perspectives

Johnson, Paul M.; Brady, Corey E.; Philip, Craig; Baroud, Hiba; Camp, Janey V.; Abkowitz, Mark. (2020). Risk Analysis

Johnson, Paul M.; Bennartz, Ralf; Camp, Janey V. (2019). Applied Geography

Philip, Craig E.; Johnson, Paul. (2018). . Marine News

PhD: Computational Mathematics, University of North Carolina at Greensboro

Research Interests: My research interests include statistical genetics, high-dimensional data analysis, robust statistics, and deep neural networks, with a strong focus on practical applications in genomics and cancer research. I have developed robust statistical methods to address the challenges of complex high-dimensional data, including data contamination, heteroscedasticity, and structured sparsity. My work extends to advanced methodologies for outlier detection and variable selection, which I actively apply in cancer clinical trials to identify predictive biomarkers and enhance prognostic models. Moving forward, I aim to integrate AI techniques into areas of high-dimensional data and robust statistics, focusing on improving real-world data analysis across various domains, particularly within the health sciences.

Selected Publications: 

Nixon, A. B., Liu, Y., Yang, Q., Luo, B., Starr, M. D., Brady, J. C., 鈥� & Halabi, S. (2024). Prognostic and predictive analyses of circulating plasma biomarkers in men with metastatic castration-resistant prostate cancer treated with docetaxel/prednisone with or without bevacizumab. Prostate Cancer and Prostatic Diseases, 1-8.

Slovin, S. F., Knudsen, K., Halabi, S., de Leeuw, R., Shafi, A., Kang, P., Wolf, S., Luo, B., 鈥� & Kelly, K. (2023). Randomized Phase II Multicenter Trial of Abiraterone Acetate With or Without Cabazitaxel in the Treatment of Metastatic Castration-Resistant Prostate Cancer. Journal of Clinical Oncology, 41(32), 5015-5024.

Halabi, S., Yang, Q., Roy, A., Luo, B., Araujo, J. C., Logothetis, C., 鈥� & Kelly, W. K. (2023). External validation of a prognostic model of overall survival in men with chemotherapy-naive metastatic castration-resistant prostate cancer. Journal of Clinical Oncology, 41(15), 2736-2746.

Luo, B., Gao, X., & Halabi, S. (2022). Penalized weighted proportional hazards model for robust variable selection and outlier detection. Statistics in Medicine, 41(17), 3398-3420.

Luo, B., & Gao, X. (2022). High-dimensional robust approximated M-estimators for mean regression with asymmetric data. Journal of Multivariate Analysis, 192, 105080.

Luo, B., & Gao, X. (2022). A high-dimensional M-estimator framework for bi-level variable selection. Annals of the Institute of Statistical Mathematics, 74(3), 559-579.

Peng, Y., Luo, B., & Gao, X. (2022). Robust Moderately Clipped LASSO for Simultaneous Outlier Detection and Variable Selection. Sankhya B, 84(2), 694-707.

Nixon, A.B., Halabi, S., Liu, Y., Starr, M.D., Brady, J.C., Shterev, I., Luo, B., 鈥� & George, D. J. (2022). Predictive biomarkers of overall survival in patients with metastatic renal cell carcinoma treated with IFN伪卤bevacizumab: results from CALGB 90206 (Alliance). Clinical Cancer Research, 28(13), 2771-2778.

Luo, B., Yang, Q., & Halabi, S. (2021). Variable selection approaches in high-dimensional space. Modern Statistical Methods for Health Research, 301-327.

PhD: Applied Statistics and Research Methods, University of Northern Colorado

Research Interests: Dr. Matheny鈥檚 research expertise and interests are centered on improving patient-reported outcomes through modern psychometric statistical and methodological techniques including Item Response Theory and the Rasch Measurement Model, used to assess and develop data collection methods and outcome instrumentation in health outcomes research, with a special focus in orthopaedics and sports medicine. 

As a methodological researcher, she is often found embedding a research study within a study, working simultaneously to not only analyze actual patient outcomes, but also improve the methods in which the data are collected and analyzed, including the instrument itself.

Dr. Matheny鈥檚 other primary research interests include data integrity assessment and survey quality control integration, health outcomes and public health study design, survey development, longitudinal study design and statistical modeling, psychometric analysis and assessment of commonly used but problematic instruments in a variety of other fields, as well as analyzing differential item functioning (DIF).

Selected Publications: 

Plancher, K. D., Matheny, L. M., Briggs, K. K., & Petterson, S. C. (2022). Reliability and Validity of the Knee Injury and Osteoarthritis Outcome Score in Patients Undergoing Unicompartmental Knee Arthroplasty. The Journal of Arthroplasty, S0883-5403(22), 00475-2. Epub ahead of print. PMID: 35487406.

Matheny, L. M., Gittner, K., Harding, J., & Clanton, T. O. (2021). Patient reported outcome measures in the foot and ankle: normative values do not reflect 100% full function. Knee Surgery, Sports Traumatology, Arthroscopy, 29(4), 1276-1283.

Mullens, J., Stake, I. K., Matheny, L. M., Daney, B., & Clanton, T. O. (2021). Relationship between tibiotalar joint space and ankle function following ankle surgery. Foot & Ankle International, 42(3), 314-319.

Nott, E., Matheny, L. M., Clanton, T. O., Lockard, C., Douglass, B. W., Tanghe, K. K., Matta, N., & Brady, A. W. (2021). Accessibility and Thickness of Medial and Lateral Talar Body Cartilage for Treatment of Ankle and Foot Osteochondral Lesions. Foot & Ankle International, 42(10), 1330-1339.

Matheny, L. M., & Clanton, T. O. (2020). Rasch analysis of reliability and validity of scores from the foot and ankle ability measure (FAAM). Foot & Ankle International, 41(2), 229-236.        

LaPrade, R. F., Matheny, L. M., Moulton, S. G., James, E. W., & Dean, C. S. (2017). Posterior meniscal root repairs: outcomes of an anatomic transtibial pull-out technique. The American journal of sports medicine, 45(4), 884-891.

Matheny, L. M., Ockuly, A. C., Steadman, J. R., & LaPrade, R. F. (2015). Posterior meniscus root tears: associated pathologies to assist as diagnostic tools. Knee Surgery, Sports Traumatology, Arthroscopy, 23(10), 3127-3131.

Steadman, J. R., Matheny, L. M., Singleton, S. B., Johnson, N. S., Rodkey, W. G., Crespo, B., & Briggs, K. K. (2015). Meniscus suture repair: minimum 10-year outcomes in patients younger than 40 years compared with patients 40 and older. The American journal of sports medicine, 43(9), 2222-2227. 

Steadman, J. R., Briggs, K. K., Matheny, L. M., & Ellis, H. B. (2013). Ten-year survivorship after knee arthroscopy in patients with Kellgren-Lawrence grade 3 and grade 4 osteoarthritis of the knee. Arthroscopy: The Journal of Arthroscopic & Related Surgery, 29(2), 220-225.            

Clanton, T. O., Matheny, L. M., Jarvis, H. C., & Jeronimus, A. B. (2012). Return to play in athletes following ankle injuries. Sports Health, 4(6), 471-474.  

Ellis, H. B., Matheny, L. M., Briggs, K. K., Pennock, A. T., & Steadman, J. R. (2012). Outcomes and revision rate after bone鈥損atellar tendon鈥揵one allograft versus autograft anterior cruciate ligament reconstruction in patients aged 18 years or younger with closed physes. Arthroscopy: The Journal of Arthroscopic & Related Surgery, 28(12), 1819-1825.     

Steadman, J. R., Matheny, L. M., Briggs, K. K., Rodkey, W. G., & Carreira, D. S. (2012). Outcomes following healing response in older, active patients: a primary anterior cruciate ligament repair technique. The Journal of Knee Surgery, 25(03), 255-260.

Sterett, W. I., Steadman, J. R., Huang, M. J., Matheny, L. M., & Briggs, K. K. (2010). Chondral resurfacing and high tibial osteotomy in the varus knee: survivorship analysis. The American journal of sports medicine, 38(7), 1420-1424.

PhD: Biostatistics and Data Science, University of Louisville School of Public Health and Information Sciences

Research Interests: Dr. Ray鈥檚 research interest includes methodology development for imbalanced data, clinical trial design, and the application areas of healthcare and education. He is also interested in incorporation of Real-World Data into clinical trials.

Selected Publications: 

Healthcare
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.

Education
Ndembera, R., Hao, J., Fallin, R., Ray, H. E., Shah, L., Rushton, G. T. (2021). Demographic factors that influence performance on the Praxis Earth and Space Science: Content Knowledge Test, Journal of Geoscience Education, 69:4, 401-410, DOI: 10.1080/10899995.2020.1813866. (https://www.tandfonline.com/doi/abs/10.1080/10899995.2020.1813866)

Rushton, G. T., Rosengrant, D., Dewar*, A., Shah, L., Ray, H. E., Sheppard, K., Watanabe, L., Watanabe. (2017).  Towards a high quality high school workforce: A longitudinal, demographic analysis of U.S. public school physics teachers. Physics Review Physics Education Research, 13(2), 020112.  https://journals.aps.org/prper/abstract/10.1103/PhysRevPhysEducRes.13.020122 

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 鈥� 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鈥�581.

PhD: Analytics and Data Science, 黑料网

Research Interests: My research interest lies in bias quantification and mitigation in Large Language Models (LLMs). LLMs which always include humans in the consuming end. Although LLMs have been shown to have accuracy close to or better than humans, it is essential to check whether various biases are present in them with the help of various metrics and measures.  Quantifying wanted and unwanted biases before bringing the models into production could be used to prevent amplification of unwanted biases back in society or enhance necessary biases for the LLMs' performance. Once bias is appropriately quantified one can take measures to mitigate it as far as possible.

Selected Publications: 

Don, D. R., Boardman, J., Sayenju, S., Aygun, R., Zhang, Y., Franks, B., ... & Modgil, G. (2023). Automation of Explainability Auditing for Image Recognition. International Journal of Multimedia Data Engineering and Management (IJMDEM), 14(1), 1-17.

Sayenju, S., Aygun, R., Franks, B., Johnston, S., Lee, G., Choi, H., & Modgil, G. (2023, June).  Quantifying Domain Knowledge in Large Language Models. In 2023 IEEE Conference on Artificial Intelligence (CAI) (pp. 193-194). IEEE.

Don, D. R., Boardman, J., Sayenju, S., Aygun, R., Zhang, Y., Franks, B., ... & Modgil, G. (2022, August). Explainability Audit: An Automated Evaluation of Local Explainability in Rooftop Image Classification. In 2022 IEEE 23rd International Conference on Information Reuse and Integration for Data Science (IRI) (pp. 184-189). IEEE.

Sayenju, S., Aygun, R., Boardman, J., Don, D. P. R., Zhang, Y., Franks, B., ... & Modgil, G. (2022). Quantification and Mitigation of Directional Pairwise Class Confusion Bias in a Chatbot Intent Classification Model. International Journal of Semantic Computing, 1-24.

Sayenju, S., Aygun, R., Boardman, J., Don, D. P. R., Zhang, Y., Franks, B., ... & Modgil, G. (2022, January). Directional Pairwise Class Confusion Bias and Its Mitigation. In 2022 IEEE 16th International Conference on Semantic Computing (ICSC) (pp. 67-74). IEEE.

PhD: Educational Psychology: Cognition and Development, University of Georgia

Research Interests:  Structural equation modeling, multilevel modeling, psychometrics, learning sciences 

Selected Publications:

Vaughn, A., Johnson, M., & Taasoobshirazi, G. (2020). . Studies in Higher Education, 45(4), 780-795. 

Taasoobshirazi, G., Puckett, C., & Marchand, G., (2019). . International Journal of Mathematics and Science Education, 17 (7), 1267-1282. 

Sunny, C.E., Taasoobshirazi, G., Clark, L., & Marchand, G. (2017). . Instructional Science, 45(2)-157-175.   

Carr, M., & Taasoobshirazi, G. (2017). . Learning and Individual Differences, 54, 102-108. 

Taasoobshirazi, G., & Wang, S. (2016). . Journal of Applied Quantitative Methods, 11(3).  

Taasoobshirazi, G., Heddy, B., Bailey, M., & Farley, J. (2016). . Instructional Science, 44(2), 125-145. 

PhD: Biostatistics, University of Alabama at Birmingham

Research Interests: My research focuses on two major areas, the first of which majorly studies statistical methodology for analyzing cancer genomics and metagenomics data. In this area, my research interests include: (1) develop and apply Bayesian statistical methods for cancer survival prediction with high dimensional genomics by incorporating systems biology or computational biology with a published R package BhGLM in this area; (2) Microbiome/Metagenomics Data Analysis: applying existing methods and developing Bayesian over-dispersed and zero-inflated models for microbiome association studies, with an R package NBZIMM published in this area. My second area of research consists of extensive collaborative research on various medical and public health related topics.

Selected Publications:

Zhang, X; Yi, N. NBZIMM: negative binomial and zero-inflated mixed models, with application to microbiome/metagenomics data analysis. Oct 2020. BMC Bioinformatics. 

Zheng, H; Song Q; Zhang, C; Sun, W; Mao, M; Zhang, X; Zhu, X; Ma, G; Mao, D. The effect of text-based math task on dynamic stability control during stair descent. Oct 2020.

Zhang, X; Li, B.; Han, H.; Song, S.; Xu, H.; Yi, Z.; Yi, N. . Dec 2018. Bioinformatics, 34(21), 3609-3615.

Zhang, X; Li, B.; Han, H.; Song, S.; Xu, H.; Hong, Y.; Zhuang, W. . Dec 2018. BMC cancer, 18(1), 551.

Zhang, X; Pei, Y. F.; Zhang, L.; Guo, B.; Pendegraft, A.; Zhuang, W.; Yi, N. . July 2018. Frontiers in microbiology, 9, 1683.

Yi, N.; Tang, Z.; Zhang, X; Guo, B. . Sep 2018. Bioinformatics.

Tang, Z; Shen, Y; Li, Y; Zhang, X; Yi, N. Group Spike-and-Slab Lasso Generalized Linear Models for Disease Prediction and Associated Genes Detection by Incorporating Pathway Information. Bioinformatics. Oct 2017; .

Zhang, X; Li, Y; Akinyemiju, T; Ojesina, A; Xu, B; Yi, N. Pathway-Structured Predictive Model for Cancer Survival Prediction: A Two-Stage Approach. Genetics Early online Nov 2016; 

Tian, S; Zhang, X; Jiang, R; Pillai, R; Owonikoko, T; Steuer, C; Saba, N; Pakkala, S; Patel, P; Belani, C; Khuri, F; Curran, W; Ramalingam, S; Behera, M; Higgins, K. Survival Outcomes with Thoracic Radiotherapy in Extensive-Stage Small Cell Lung Cancer: A Propensity-Score Matched Analysis of the National Cancer Data Base. May 2019. Clinical Lung Cancer. 

Cassidy, R; Zhang, X; Switchenko, J; Patel, P; Shelton, J; Tian, S; Nanda, R; Steuer, C; Pillai,R; Owonikoko, T; Ramalingam, S; Fernandez, F; Force, S; Gillespie, T; Curran, W; Higgins,K. Health care disparities among octogenarians and nonagenarians with stage III lung cancer: Elderly Patients With Stage III Lung Cancer. Cancer. Jan 2018; .