Search Results for author: Peter J. Rousseeuw

Found 10 papers, 3 papers with code

Fast Linear Model Trees by PILOT

no code implementations8 Feb 2023 Jakob Raymaekers, Peter J. Rousseeuw, Tim Verdonck, Ruicong Yao

Linear model trees are regression trees that incorporate linear models in the leaf nodes.

Model Selection regression

The Cellwise Minimum Covariance Determinant Estimator

no code implementations27 Jul 2022 Jakob Raymaekers, Peter J. Rousseeuw

On the other hand, cellwise outliers are individual cells in the data matrix.

Silhouettes and quasi residual plots for neural nets and tree-based classifiers

no code implementations16 Jun 2021 Jakob Raymaekers, Peter J. Rousseeuw

Here we pursue a different goal, which is to visualize the cases being classified, either in training data or in test data.

Fast and Eager k-Medoids Clustering: O(k) Runtime Improvement of the PAM, CLARA, and CLARANS Algorithms

3 code implementations12 Aug 2020 Erich Schubert, Peter J. Rousseeuw

While we do not study the parallelization of our approach in this work, it can easily be combined with earlier approaches to use PAM and CLARA on big data (some of which use PAM as a subroutine, hence can immediately benefit from these improvements), where the performance with high k becomes increasingly important.

Clustering

Outlier detection in non-elliptical data by kernel MRCD

1 code implementation5 Aug 2020 Joachim Schreurs, Iwein Vranckx, Mia Hubert, Johan A. K. Suykens, Peter J. Rousseeuw

The minimum regularized covariance determinant method (MRCD) is a robust estimator for multivariate location and scatter, which detects outliers by fitting a robust covariance matrix to the data.

Outlier Detection

Class maps for visualizing classification results

no code implementations28 Jul 2020 Jakob Raymaekers, Peter J. Rousseeuw, Mia Hubert

A classification method first processes a training set of objects with given classes (labels), with the goal of afterward assigning new objects to one of these classes.

Classification General Classification +1

Transforming variables to central normality

no code implementations16 May 2020 Jakob Raymaekers, Peter J. Rousseeuw

Many real data sets contain numerical features (variables) whose distribution is far from normal (gaussian).

Faster k-Medoids Clustering: Improving the PAM, CLARA, and CLARANS Algorithms

4 code implementations12 Oct 2018 Erich Schubert, Peter J. Rousseeuw

It can easily be combined with earlier approaches to use PAM and CLARA on big data (some of which use PAM as a subroutine, hence can immediately benefit from these improvements), where the performance with high k becomes increasingly important.

Clustering

Robust Monitoring of Time Series with Application to Fraud Detection

no code implementations28 Aug 2017 Peter J. Rousseeuw, Domenico Perrotta, Marco Riani, Mia Hubert

Time series often contain outliers and level shifts or structural changes.

Computation

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