Biography

I am PhD student in statistics and R-package developer with a particular interest for statistical learning, optimization, and data visualization.

Interests

  • Machine Learning
  • Stochastic Optimization
  • Reproducible Research
  • Package Development
  • Data Visualization
  • High-Performance Computing

Education

  • BSc Statistics, 2018

    Lund University

  • MSc Medical Sciences, 2016

    Lund University

  • BSc Physical Therapy, 2014

    Lund University

Recent Posts

SLOPE 0.2.0

A new version of the SLOPE package has been released with a great number of improvements and much new functionality.
Last updated on Apr 16, 2020 4 min read R

Polygon labeling with polylabelr

Using polylabelr to find visual centers of polygons and label Euler diagrams
Last updated on Apr 14, 2020 3 min read R

Finding the farthest points in a point cloud

A better algorithm for finding a subset of points that maximize the minimal distance between them.
Last updated on Oct 21, 2018 4 min read R

Introducing eulerr

This is an introduction to my package, eulerr, an R-package that computes and plots Euler diagrams for set relationships.
Last updated on Apr 14, 2020 4 min read R

Introducing qualpalr

Let me introduce qualpalr: an R package that generates qualitative color palettes with distinct colors using color difference algorithms.
Last updated on Oct 21, 2018 5 min read R

Featured Publications

A Case Study in Fitting Area-Proportional Euler Diagrams with Ellipses Using Eulerr

The R package eulerr fits area-proportional elliptical Euler diagrams to set relationships using numerical optimization and exact-area routines. This paper presents a few case studies in fitting diagrams using eulerr.
PDF Slides

eulerr: Area-Proportional Euler Diagrams with Ellipses

In this thesis, we provide and outline an R-based implementation called eulerr. It fits Euler diagrams using numerical optimization and …
PDF Source Document

Mapping physical therapy research: the geographical affiliations and methodological quality of 2,959 randomized controlled trials

Evidence suggests that research benefits from diversity, yet science is concentrated to a small group of countries. Diversity in …
Preprint DOI Supplement

Recent Publications

Quickly discover relevant content by filtering publications.
A Case Study in Fitting Area-Proportional Euler Diagrams with Ellipses Using Eulerr
Johan Larsson, Peter Gustafsson
PDF Slides
eulerr: Area-Proportional Euler Diagrams with Ellipses
Johan Larsson
PDF Source Document
Mapping physical therapy research: the geographical affiliations and methodological quality of 2,959 randomized controlled trials
Johan Larsson
Preprint DOI Supplement
Sex-based differences in pain distribution in a cohort of patients with persistent post-traumatic neck pain
Hans Westergren, Johan Larsson, Michael Freeman, Anna Carlsson, Anna Jöud, Eva-Maj Malmström
Preprint DOI
Vestibular asymmetry increases double support time variability in a counter-balanced study on elderly fallers
Johan Larsson, Michael Miller, Eva Ekvall Hansson
Preprint DOI
See all publications

Software

*
All R

SLOPE

Sorted L1 Penalized Estimation

polylabelr

Find the Pole of Inaccessibility (Visual Center) of a Polygon.

eulerr

Area-Proportional Euler and Venn Diagrams with Circles or Ellipses.

qualpalr

Automatic Generation of Qualitative Color Palettes.

sgdnet

Fast Sparse Linear Models for Big Data with SAGA.

tactile

New and Extended Plots, Methods, and Panel Functions for Lattice.

Tags

Color Science Data Visualization Elastic Net Euler diagrams eulerr generalized-linear-models geometry labeling lattice machine-learning Meta Research Physical Therapy polygon Polygons polylabelr qualpalr R regularization SLOPE Venn diagrams

Contact

Recent & Upcoming Talks

The Strong Screening Rule for SLOPE

A brief talk explaining the rationale, intuition, and basic concept of screening rules for SLOPE.
May 8, 2020 12:46 PM — 12:46 PM online
PDF Slides Video

Links

r-bloggers
R news and tutorials contributed by hundreds of R bloggers, which is nice enough to publish my posts regarding R
Machine Learning Summer School
Summer schools for students in machine learning
Google summer of code with the R project
The R project is active in GSOC, which I have been a student and mentor for.
Overleaf
An online LaTeX Editor, which supports Sweave (R-integrated documents for LaTeX), collaboration, github integration, and much more. Joining overleaf by clicking the link above helps me get some additional features too, so please consider giving it a try.