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.
- 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
- 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
- (2022)
- Statistica SinicaStatistics and Probability Letters
- (2022)
- Environmental Modeling and AssessmentScandinavian Journal of StatisticsJournal of Multivariate Analysis
- 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 AnalysisAustrian Journal of Statistics
- Dimension Reduction for Time Series in a Blind Source Separation Context Using R (2021)
- Journal of Statistical SoftwareBiometrika
- (2021)
- Electronic Journal of Statistics
- (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 orderAsymptotic and Bootstrap Tests for the Dimension of the Non-Gaussian Subspace2021
- Fast tensorial JADEIndependent component analysis for multivariate functional data (2020)
- (2020)
- Minimum Distance Index for BSS, Generalization, Interpretation and Asymptotics (2020)
- (2020)
- Independent component analysis for non-standard data structures (2018) Virta Joni
- JADE for Tensor-Valued Observations2018
- Journal of Computational and Graphical Statistics
- On the number of signals in multivariate time series (2018)
- Lecture Notes in Computer Science
- Tensorial blind source separation for improved analysis of multi-omic data (2018)
- Genome Biology
- (2017)
- IEEE Signal Processing Letters



