Articles by Achim Zeileis

Remembering Friedrich “Fritz” Leisch

January 21, 2025 | Achim Zeileis

Our friend and colleague Fritz Leisch died in April last year. In a new contribution to The R Journal we honor Fritz and commemorate his many contributions to science in general and to the R community in particular. Citation Be... [Read more...]

Examining exams using Rasch models and assessment of measurement invariance

September 30, 2024 | Achim Zeileis

Models from psychometric item response theory are used to analyze the results from a large introductory mathematics exams in order to gain insights about student abilities, question difficulties, and heterogeneities of these in subgroups. ...

Modeling loss aversion with extended-support beta regression

September 22, 2024 | Achim Zeileis

The recently-proposed extended-support beta regression model in R package betareg is illustrated by simultaneously modeling the occurrence and extent of loss aversion in a behavioral economics experiment. Motivation To illustra...

Extended-support beta regression for [0, 1] responses

September 15, 2024 | Achim Zeileis

New arXiv working paper introducing extended-support beta regression models which can capture probabilities for boundary observations at 0 and/or 1. It is available in the latest R package betareg, also accompanied by a new altdoc web page. ... [Read more...]

colorspace: A Python Toolbox for Colors and Palettes

July 29, 2024 | Achim Zeileis

Python package 'colorspace' with tools for manipulating and assessing colors and palettes is now available from PyPI, accompanied by a documentation web page and an arXiv paper. Citation Reto Stauffer, Achim Zeileis (2024). “...

Evaluation of the UEFA Euro 2024 group stage forecast

June 27, 2024 | Achim Zeileis

A look back on the group stage of the UEFA Euro 2024 to check whether our ensemble machine learning forecasts based were any good... How surprising was the group stage? This week the group stage of the UEFA Euro 2024 was conclu...

UEFA Euro 2024 forecast: Netherlands vs. Austria

June 24, 2024 | Achim Zeileis

Detailed probabilistic forecast for the match Netherlands vs. Austria at UEFA Euro 2024 in Group D, accompanying a conference presentation at Imagine 2024. Machine learning ensemble In a recent blog post, prior to the start of ...

Forecasting the UEFA Euro 2024 with a machine learning ensemble

June 9, 2024 | Achim Zeileis

Probabilistic forecasts for the UEFA Euro 2024 are obtained by using a hybrid model that combines data from four advanced statistical models. The favorite is France, followed by England and host Germany. Football fans arou...

Subgroup detection in linear growth curve models

November 12, 2023 | Achim Zeileis

New arXiv working paper showing how generalized linear mixed effects model (GLMM) trees, along with their R implementation in the glmertree package, can be used to identify subgroups with differently shaped trajectories in linear growth curve...

Probabilistic forecasting for the FIFA Women’s World Cup 2023

July 16, 2023 | Achim Zeileis

Winning probabilities for all teams in the FIFA Women's World Cup are obtained using a consensus model based on quoted bookmakers' odds. The favorite is defending World Champion United States, followed by European Champion England, and Spain....

Tree models for assessing covariate-dependent method agreement

July 11, 2023 | Achim Zeileis

New arXiv working paper introducing conditional method agreement trees (COAT) which can capture the dependency of a Bland-Altman analysis on covariates. It is ccompanied by an R implementation in the CRAN package coat. Citation ...

CRAN Task Views: The next generation

May 30, 2023 | Achim Zeileis

New arXiv working paper on the relaunch of the CRAN Task View Initiative providing better infrastructure and workflows for proposing and maintaining CRAN Task Views and fostering interactions with the R community. Citation Achi...

Color vision deficiency emulation fixed in colorspace 2.1-0

May 7, 2023 | Achim Zeileis

The color vision deficiency emulation provided by R package colorspace was inaccurate for some highly-saturated colors due to a bug that was fixed in version 2.1-0. The (typically small) differences are illustrated for a range of palettes. ...

Coloring in R’s blind spot

May 4, 2023 | Achim Zeileis

New arXiv working paper on the new color palette functions palette.colors() and hcl.colors() in base R since version 4.0.0. Citation Achim Zeileis, Paul Murrell (2023). “Coloring in R’s Blind Spot.” arXiv.org E-Print Archive ar...

Amplification of Lightning in the European Alps 1980-2019

May 3, 2023 | Achim Zeileis

Detailed measurements of lightning as well as reanalyses of atmospheric conditions enable the reconstruction of lightning probabilities over large spatial and temporal domains. Using flexible additive regression models it is shown that lightn...

Machine learning of a 2022 FIFA World Cup multiverse

November 13, 2022 | Achim Zeileis

Probabilistic forecasts for the 2022 FIFA World Cup are obtained by using a hybrid model that combines data from three advanced statistical models through random forests. The favorite is Brazil, followed by Argentina, Netherlands, Germany, an...

Probabilistic forecasting for the UEFA Women’s Euro 2022

July 3, 2022 | Achim Zeileis

Using a consensus model based on quoted bookmakers' odds winning probabilities for all competing teams in the UEFA Women's Euro are obtained: The favorite is Spain, followed by host England, France, and the Netherlands as the defending champ...

Model-Based Causal Forests for Heterogeneous Treatment Effects

July 1, 2022 | Achim Zeileis

A new arXiv paper investigates which building blocks of random forests, especially causal forests and model-based forests, make them work for heterogeneous treatment effect estimation, both in randomized trials and observational studies. ...

distributions3 @ useR! 2022

June 26, 2022 | Achim Zeileis

Conference presentation about the 'distributions3' package for S3 probability distributions (and 'topmodels' for graphical model assessment) at useR! 2022: Slides, video, replication code, and vignette. Abstract (Authors: Achim...

The Poisson distribution: From basic probability theory to regression models

June 22, 2022 | Achim Zeileis

Brief introduction to the Poisson distribution for modeling count data using the distributions3 package. The distribution is illustrated using the number of goals scored at the 2018 FIFA World Cup, suitable for self-study or as a classroom ex...

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