[HTML][HTML] Additive autoencoder for dimension estimation

T Kärkkäinen, J Hänninen - Neurocomputing, 2023 - Elsevier
Dimension reduction is one of the key data transformation techniques in machine learning
and knowledge discovery. It can be realized by using linear and nonlinear transformation …

Extreme minimal learning machine: Ridge regression with distance-based basis

T Kärkkäinen - Neurocomputing, 2019 - Elsevier
The extreme learning machine (ELM) and the minimal learning machine (MLM) are
nonlinear and scalable machine learning techniques with a randomly generated basis. Both …

[HTML][HTML] Expert-based versus citation-based ranking of scholarly and scientific publication channels

M Saarela, T Kärkkäinen, T Lahtonen, T Rossi - Journal of Informetrics, 2016 - Elsevier
The Finnish publication channel quality ranking system was established in 2010. The
system is expert-based, where separate panels decide and update the rankings of a set of …

[HTML][HTML] A data–model approach to interpreting speleothem oxygen isotope records from monsoon regions

SE Parker, SP Harrison, L Comas-Bru… - Climate of the …, 2021 - cp.copernicus.org
Reconstruction of past changes in monsoon climate from speleothem oxygen isotope (δ 18
O) records is complex because δ 18 O signals can be influenced by multiple factors …

[PDF][PDF] Predicting math performance from raw large-scale educational assessments data: a machine learning approach

M Saarela, B Yener, MJ Zaki… - JMLR workshop and …, 2016 - academia.edu
Large-scale educational assessment studies (LSAs) regularly collect massive amounts of
very rich cognitive and contextual data of whole student populations. Currently, LSAs are …

Toolbox for distance estimation and cluster validation on data with missing values

M Niemelä, S Äyrämö, T Kärkkäinen - IEEE Access, 2021 - ieeexplore.ieee.org
Missing data are unavoidable in the real-world application of unsupervised machine
learning, and their nonoptimal processing may decrease the quality of data-driven models …

Knowledge discovery from the programme for international student assessment

M Saarela, T Kärkkäinen - … : Fundaments, Applications, and Trends: A View …, 2017 - Springer
Abstract The Programme for International Student Assessment (PISA) is a worldwide study
that assesses the proficiencies of 15-year-old students in reading, mathematics, and science …

Research on real time feature extraction method for complex manufacturing big data

X Kong, J Chang, M Niu, X Huang, J Wang… - … International Journal of …, 2018 - Springer
Big data related to manufacturing applications has the traits such as great quantity, multi-
sources, low value density, high complexity, and dynamic state. Traditional feature extraction …

On the role of Taylor's formula in machine learning

T Kärkkäinen - Impact of Scientific Computing on Science and Society, 2023 - Springer
The classical Taylor's formula is an elementary tool in mathematical analysis and function
approximation. Its role in the optimization theory, whose data-driven variants have a central …

Do Country Stereotypes Exist in PISA? A Clustering Approach for Large, Sparse, and Weighted Data.

M Saarela, T Kärkkäinen - International Educational Data Mining Society, 2015 - ERIC
Certain stereotypes can be associated with people from different countries. For example, the
Italians are expected to be emotional, the Germans functional, and the Chinese hard …