Research

Peer-reviewed journal articles

• Wang, S., Christou, E., Solea, E., and Song, J. (2026). Nonlinear Sufficient Dimension Reduction for Conditional Quantiles in Scalar-on-Function Single-Index Model. Statistics and Computing, 36(1), 32. DOI
• Wang, S., Christou, E., Solea, E., and Song, J. (2025). Dimension Reduction for the Conditional Quantiles of Functional Data with Categorical Predictors. Biometrical Journal, 67(6). DOI
• Christou, E., Solea, E., Wang, S., and Song, J. (2025). Sufficient Dimension Reduction for Conditional Quantiles of Functional Data. Statistica Sinica. DOI: 10.5705/ss.202024.0211 · PDF

Manuscripts under review

Summerlee, D., Sun, S., Wang, S., Christou, E., and Gao, W. Functional Data Approaches for Hypertension: A Comparative Study of Statistical and Machine Learning Models Using NHANES. Under review.

Manuscripts in preparation

Quantile Martingale Difference Divergence for Functional Predictors: Dimension Reduction in Conditional Quantile Models. With Dr. Eliana Christou. In preparation.

Software

Christou, E., Donkor, P., Hogshead, N., Solea, E., Song, J., Stitz, A., and Wang, S. (2024–). fquantdr: Dimension Reduction Techniques for Conditional Quantiles of Functional Data. R package, in progress. GitHub

Presentations

Nonlinear Sufficient Dimension Reduction for Conditional Quantiles in Scalar-on-Function Single-Index Models

1. CFE-CMStatistics 2026 — 20th International Joint Conference on Computational and Financial Econometrics and Computational and Methodological Statistics, HTW Berlin, University of Applied Sciences, Berlin, Germany. December 2026. Invited talk; upcoming.
2. EcoSta 2026 — 9th International Conference on Econometrics and Statistics, Ryukoku University, Kyoto, Japan. August 2026. Invited talk.
3. NESS 2026 — 39th Annual New England Statistics Symposium, University of Connecticut, Hartford, USA. May 2026. Invited talk.

Dimension Reduction for Conditional Quantiles for Functional Data with Categorical Predictors

1. NISS Virtual New Researchers Conference. June 2025.
2. CMStatistics 2024 — 17th International Conference of the ERCIM WG on Computational and Methodological Statistics, King’s College London, London, UK. December 2024. Invited talk.
3. UNCC Math Day Symposium. October 2024.
4. EcoSta 2024 — 7th International Conference on Econometrics and Statistics, Beijing Normal University, Beijing, China. July 2024. Invited talk.
5. Graduate Research Symposium. March 2024.