Joni Virta
Academy Research Fellow/Assistant Professor
jomivi@utu.fi +358 29 450 4321 +358 50 350 9623 : 262 |
Dimension reduction; Multivariate statistics; Asymptotic statistics
Robust non-linear multivariate methods
I obtained my PhD in Statistics from University of Turku in 2018 under the supervision of Hannu Oja, Klaus Nordhausen and Bing Li. In 2018-2019 I worked as a postdoctoral researcher in the Department of Mathematics and Systems Analysis in Aalto University School of Science and received also the title of docent from there. Between 2019-2022 I worked as an Academy of Finland Postdoctoral Researcher first in Aalto and later in Turku.
Since September 2022 I have been working at Department of Mathematics in the dual role of Academy Research Fellow and Assistant Professor (with specialization in the theoretical foundations of statistics).
My current main research area is robust non-linear methodology, which I study under my Academy Research Fellow project. In addition, my research emphasizes the modification of classical multivariate methodology (such as PCA) to work under non-standard forms of data (images, function, spatial data) and the asymptotic theory related to these questions.
Between 2022-2027 my amount of teaching will be small because of my role as an Academy Research Fellow. However, I still teach, e.g, Advanced Multivariate Methods during this period.
- Weighted embedding and outlier detection of metric space data (2025)
- Advances in Data Analysis and Classification
- Asymptotic Utility of Spectral Anonymization (2024)
- Lecture Notes in Computer Science
- Large-sample properties of non-stationary source separation for Gaussian signals (2024)
- Electronic Journal of Statistics
- Latent model extreme value index estimation (2024)
- Journal of Multivariate Analysis
- Structure-preserving non-linear PCA for matrices (2024)
- IEEE Transactions on Signal Processing
- Poisson PCA for matrix count data (2023)
- Pattern Recognition
- Robust signal dimension estimation via SURE (2023)
- Statistical Papers
- Tensorial Principal Component Analysis in Detecting Temporal Trajectories of Purchase Patterns in Loyalty Card Data: Retrospective Cohort Study (2023)
- Journal of Medical Internet Research
- Effects of physical activity intervention on 24-h movement behaviors: a compositional data analysis (2022)
- Scientific Reports
- ICS for multivariate functional anomaly detection with applications to predictive maintenance and quality control (2022)
- Econometrics and Statistics
- Signal dimension estimation in BSS models with serial dependence (2022) 2022 International Conference on Electrical, Computer, Communications and Mechatronics Engineering (ICECCME) Nordhausen Klaus, Taskinen Sara, Virta Joni
- Sliced Inverse Regression in Metric Spaces (2022)
- Statistica Sinica
- The “Seili‑index” for the Prediction of Chlorophyll‑α Levels in the Archipelago Sea of the northern Baltic Sea, southwest Finland (2022)
- Environmental Modeling and Assessment
- Determining the signal dimension in second order source separation (2021)
- Statistica Sinica
- Dimension Estimation in Two-Dimensional PCA (2021)
- International Symposium on Image and Signal Processing and Analysis
- Dimension Reduction for Time Series in a Blind Source Separation Context Using R (2021)
- Journal of Statistical Software
- Large-sample properties of blind estimation of the linear discriminant using projection pursuit (2021)
- Electronic Journal of Statistics
- On the behavior of extreme d-dimensional spatial quantiles under minimal assumptions (2021) Advances in Contemporary Statistics and Econometrics: Festschrift in Honor of Christine Thomas-Agnan Paindaveine Davy, Virta Joni
- Testing for subsphericity when n and p are of different asymptotic order (2021)
- Statistics and Probability Letters
- Fast tensorial JADE (2020)
- Scandinavian Journal of Statistics