Joni Virta
Academy Research Fellow/Assistant Professor
jomivi@utu.fi +358 29 450 4321 +358 50 350 9623 Office: 262 ORCID identifier: https://orcid.org/0000-0002-2150-2769 |
Dimension reduction; Multivariate statistics; Asymptotic statistics
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.
- Latent model extreme value index estimation (2024)
- Journal of Multivariate Analysis
(Refereed journal article or data article (A1)) - Poisson PCA for matrix count data (2023)
- Pattern Recognition
(Refereed journal article or data article (A1)) - Robust signal dimension estimation via SURE (2023)
- Statistical Papers
(Refereed journal article or data article (A1)) - Tensorial Principal Component Analysis in Detecting Temporal Trajectories of Purchase Patterns in Loyalty Card Data: Retrospective Cohort Study (2023)
- Journal of Medical Internet Research
(Refereed journal article or data article (A1)) - Effects of physical activity intervention on 24-h movement behaviors: a compositional data analysis (2022)
- Scientific Reports
(Refereed journal article or data article (A1)) - ICS for multivariate functional anomaly detection with applications to predictive maintenance and quality control (2022)
- Econometrics and Statistics
(Refereed journal article or data article (A1)) - 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
(Refereed article in conference proceedings (A4)) - Sliced Inverse Regression in Metric Spaces (2022)
- Statistica Sinica
(Refereed journal article or data article (A1)) - 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
(Refereed journal article or data article (A1)) - Determining the signal dimension in second order source separation (2021)
- Statistica Sinica
(Refereed journal article or data article (A1)) - Dimension Estimation in Two-Dimensional PCA (2021)
- International Symposium on Image and Signal Processing and Analysis
(Refereed article in conference proceedings (A4)) - Dimension Reduction for Time Series in a Blind Source Separation Context Using R (2021)
- Journal of Statistical Software
(Refereed journal article or data article (A1)) - Large-sample properties of blind estimation of the linear discriminant using projection pursuit (2021)
- Electronic Journal of Statistics
(Refereed journal article or data article (A1)) - 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
(Refereed article in compilation book (A3)) - Testing for subsphericity when n and p are of different asymptotic order (2021)
- Statistics and Probability Letters
(Refereed journal article or data article (A1)) - Fast tensorial JADE (2020)
- Scandinavian Journal of Statistics
(Refereed journal article or data article (A1)) - Independent component analysis for multivariate functional data (2020)
- Journal of Multivariate Analysis
(Refereed journal article or data article (A1)) - Minimum Distance Index for BSS, Generalization, Interpretation and Asymptotics (2020)
- Austrian Journal of Statistics
(Refereed journal article or data article (A1)) - Spatial Blind Source Separation (2020)
- Biometrika
(Refereed journal article or data article (A1)) - Independent component analysis for non-standard data structures (2018) Virta Joni
(Doctoral dissertation (article) (G5))