J. Virta

activity

20152025

most citedJoint Use of Third and Fourth Cumulants in Independent Component Analysis

9 citations · 9 across the 5 of their papers we have counts for

collaborators

Showing 2021Show all

3 papers · 1 filter

math.ST2021

Poisson PCA for matrix count data

Joni Virta, Andreas Artemiou

We develop a dimension reduction framework for data consisting of matrices of counts. Our model is based on assuming the existence of a small amount of independent normal latent va…

math.ST2021

Kurtosis-based projection pursuit for matrix-valued data

Una Radojicic, Klaus Nordhausen, Joni Virta

We develop projection pursuit for data that admit a natural representation in matrix form. For projection indices, we propose extensions of the classical kurtosis and Mardia's mult…

math.ST2021

Testing for subsphericity when $n$ and $p$ are of different asymptotic order

Joni Virta

We extend a classical test of subsphericity, based on the first two moments of the eigenvalues of the sample covariance matrix, to the high-dimensional regime where the signal eige…

Poisson PCA for matrix count data

Kurtosis-based projection pursuit for matrix-valued data

Testing for subsphericity when n and p are of different asymptotic order

Testing for subsphericity when $n$ and $p$ are of different asymptotic order