Last updated: April 25, 2021

Published work

  1. Zhao Ren, Sungkyu Jung and Xingye Qiao (2022). “Covariance-engaged Classification of Sets via Linear Programming”, to appear in Statistica Sinica 32(4)
  2. Sungkyu Jung, Kiho Park and Byungwon Kim (2021). “Clustering on the torus by conformal prediction”, Accepted for publication in Annals of Applied Statistics
  3. Byungwon Kim, Seonghong Kim, Woncheol Jang, Sungkyu Jung, Johan Lim (2021). “Estimation of the case fatality rate based on stratification for the COVID-19 outbreak,” PLoS One. 16(2): e0246921.
  4. Sungkyu Jung (2021). “Geodesic projection of the von Mises-Fisher distribution for projection pursuit of directional data”, Electronic Journal of Statistics 15(1): 984-1033.
  5. Sungkyu Jung (2022). “Adjusting systematic bias in high dimensional principal component scores”, to appear in Statistica Sinica 32(3).
  6. Xing Gao, Sungwon Lee, Gen Li and Sungkyu Jung (2020). “Covariate-driven factorization by thresholding for multi-block data”, Biometrics, in print.
  7. Sungkyu Jung, Mark Foskey, and J. S. Marron (2020). “Response to `Fitting a folded normal distribution without EM’”, Annals of Applied Statistics, Vol. 14, No. 4, 2099-2100.
  8. Byungwon Kim, Joern Schulz and Sungkyu Jung (2020). “Kurtosis test of modality for rotationally symmetric distributions on hyperspheres”, The Journal of Multivariate Analysis, 178, Article 104603.
  9. Stephen M Pizer, Junpyo Hong, Jared Vicory, Zhiyuan Liu, JS Marron, Hyo-young Choi, James Damon, Sungkyu Jung, Beatriz Paniagua, Joern Schulz, Ankur Sharma, Liyun Tu and Jiyao Wang (2020). “Object shape representation via skeletal models (s-reps) and statistical analysis” In Riemannian Geometric Statistics in Medical Image Analysis (pp. 233-271). Academic Press.
  10. Byungwon Kim, Stephan Huckemann, Joern Schulz, and Sungkyu Jung (2019). “Small sphere distributions for directional data with application to medical imaging”, Scandinavian Journal of Statistics. 46(4) 1047-1071.
  11. Sungkyu Jung, Jeongyoun Ahn, and Yongho Jeon (2019). “Penalized Orthogonal Iteration for Sparse Estimation of Generalized Eigenvalue Problem” Journal of Computational and Graphical Statistics. 28(3) 710-721.
  12. Sandra E Safo, Jeongyoun Ahn, Yongho Jeon and Sungkyu Jung (2018). “Sparse Generalized Eigenvalue Problem for Canonical Correlation Analysis With Application to Integrative Analysis of Methylationand Gene Expression Data” Biometrics 74(4), December, 1362-1371.
  13. Sungkyu Jung, Myung Hee Lee and Jeongyoun Ahn (2018). “On the number of principal components in high dimensions,” Biometrika 105(2), 389-402.
  14. Sungkyu Jung (2018). “Continuum directions for supervised dimension reduction,” Computational Statistics and Data Analysis 125, 27-43.
  15. Gen Li and Sungkyu Jung (2017). “Incorporating Covariates into Integrated Factor Analysis of Multi-View Data,” Biometrics 73 (4), 1433-1442.
  16. David Groisser, Sungkyu Jung, and Armin Schwartzman (2017). “Geometric foundations for statistics on symmetric positive definite matrices: characterizations of minimal scaling-rotation curves in low dimensions”, Electronic Journal of Statistics, Vol. 11, No. 1, 1092-1159.
  17. Hao Song, Dan Ruan, Wenyang Liu, V. Andrew Stenger, Rolf Pohmann, Maria A. Fernandez Seara, Tejas Nair, Sungkyu Jung, Jingqin Luo, Yuichi Motai, Jingfei Ma, John D. Hazle and H. Michael Gach (2017). “Respiratory motion prediction and prospective correction for free-breathing arterialspin labeled perfusion MRI of the kidneys”, Medical Physics 44, 962-973.
  18. Sungkyu Jung, Armin Schwartman and David Groisser (2015). “Scaling-rotation distance and interpolation of symmetric positive-definite matrices”. SIAM. J. Matrix Anal. & Appl. 36-3, pp. 1180-1201
  19. Benjamin Eltzner, Sungkyu Jung and Stephan Huckemann (2015). “Dimension Reduction on Polyspheres with Application to Skeletal Representations” Proc. Geometric Science of Information 2015, Springer LNCS, pp. 22-29.
  20. Hao Song, Wenyang Liu, Dan Ruan, Rolf Pohmann, V. Andrew Stenger, Maria A. Fernandez Seara, Sungkyu Jung, H Michael Gach (2015). “Free-Breathing Perfusion MRI Using Multislice PCASL”, in 2015 IEEE International Symposium on Biomedical Imaging. pp. 1474-1477.
  21. Joern Schulz, Sungkyu Jung, Stephan Huckemann, Michael Pierrynowski, J. S. Marron, Stephen M. Pizer (2015) “Analysis of rotational motion from directional data”. Journal of Computational and Graphical Statistics, 24(2), 539-560.
  22. Stephen M. Pizer, Junpyo Hong, Sungkyu Jung, J.S. Marron, Joern Schulz, and Jared Vicory (2014). “Relative Statistical Performance of S-reps with Principal Nested Spheres vs. PDMs”, Proc. Shape 2014 - Symposium of Statistical Shape Models and applications. Delemont, Switzerland, June 11-13 2014:10.
  23. Sungkyu Jung (2014). “Dimension reduction for directions and 2D shapes”. Oberwolfach Reports, Volume 11, Issue 4, 2481-2527.
  24. Sungkyu Jung and Xingye Qiao (2014). “A statistical approach to set classification by feature selection with applications to classification of histopathology images”, Biometrics, 70, 536-545.
  25. Sungkyu Jung and Jason Fine (2013). Comment on “Large Covariance Estimation by Thresholding Principal Orthogonal Complements” by Fan, Liao and Mincheva, Journal of Royal Statistical Society, Series B, 75(4), 666-666.
  26. Gach H. M., Price J. C., Davis D. K., Jung S., Carney J. P., Ruszkiewicz J. A., Lopresti B. J., Laymon C. M., Mathis C. A. (2013). “Analysis of Tissue Properties and MRI Signals in the Head for PET/MRI Attenuation Correction”. Proceedings of the 21st Annual Meeting of the ISMRM, Salt Lake City, UT, April 20-26, 2013: 4358.
  27. Stephen M. Pizer, Sungkyu Jung, Dibyendusekhar Goswami, Xiaojie Zhao, Ritwik Chaudhuri, James N. Damon, Stephan Huckemann, J. S. Marron (2013). “Nested Sphere Statistics of Skeletal Models”, in Innovations for Shape Analysis: Models and Algorithms. M. Breu횩, Bruckstein and Maragos (Eds), Springer, Berlin, 93-115.
  28. Sungkyu Jung, Arusharka Sen and J. S. Marron (2012). “Boundary behavior in high dimension, low sample size asymptotics of PCA”, The Journal of Multivariate Analysis, 109, 190-203.
  29. Sungkyu Jung, Ian L. Dryden and J. S. Marron (2012). “Analysis of Principal Nested Spheres”, Biometrika, 99(3), 551-568.
  30. Sungkyu Jung (2011). “A Backward Generalization of PCA for Exploration and Feature Extraction of Manifold-Valued Shapes”, in Recent Advances in Functional Data Analysis and Related Topics, F. Ferraty (Ed), 183-188.
  31. Sungkyu Jung, Mark Foskey and J. S. Marron (2011). “Principal Arc Analysis on direct product manifolds”, The Annals of Applied Statistics, 5, 578-603.
  32. Sungkyu Jung, Xiaoxiao Liu, J. S. Marron and Stephen M. Pizer (2010). “Generalized PCA via the backward stepwise approach in image analysis”, in Brain, Body and Machine: Proceedings of an International Symposium on the 25th Anniversary of McGill University Centre for Intelligent Machines, J. Angeles et al. (Eds.) Advances in Intelligent and Soft Computing 83, 111-123.
  33. J. S. Marron, Sungkyu Jung and Ian L. Dryden (2010). “Speculation on the Generality of the Backward Stepwise View of PCA,” Proceedings of MIR 2010: 11th ACM SIGMM International Conference on Multimedia Information Retrieval, Association for Computing Machinery, Inc., Danvers, MA, 227-230.
  34. Sungkyu Jung, Mark Foskey and J. S. Marron (2010), discussion on “Intrinsic shape analysis: Geodesic PCA for Riemannian manifolds modulo isometric lie group actions” by Huckemann S., Hotz T. and Munk A., Statistica Sinica 20(1) 63-65.
  35. Sungkyu Jung and J. S. Marron (2009). “PCA consistency in High dimension, low sample size context”. The Annals of Statistics 37, 4104-4130.


  1. Woonyoung Chang, Jeongyoun Ahn and Sungkyu Jung. “Double data piling leads to perfect classification”, submitted to Electronic Journal of Statistics.
  2. Sungkyu Jung, Brian Rooks, David Groisser and Armin Schwartzman. “Averaging symmetric positive-definite matrices on the space of eigen-decompositions”, manuscript.
  3. Minwoo Kim and Sungkyu Jung. “Non-asymptotic error bound for sparse low-rank structured GEP”, manuscript.
  4. David Groisser, Sungkyu Jung, Brian Rooks, and Armin Schwartzman. “A genericity property of Frechet sample means on Riemannian maniflds”, manuscript in progress.
  5. David Groisser, Sungkyu Jung and Armin Schwartzman (2017). “Uniqueness questions in a scaling-rotation geometry on the space of symmetric positive-definite matrices”
  6. Sungwon Lee and Sungkyu Jung (2017). “Combined Analysis of Amplitude and Phase Variations in Functional Data”


  1. R package “ClusTorus”
  2. Recently developed software can be found at GitHub repo
  3. Old pieces of software can be found at here