André Calero Valdez

Junior Research Group Leader

Human-Computer Interaction Center

RWTH Aachen University


André Calero Valdez is Senior Researcher at the Chair of Communication Science and Human-Computer Interaction Center at RWTH Aachen University.

He studied computer science at RWTH Aachen University, specializing in software engineering and psychology. Due to his excellent degree, he was awarded a doctoral scholarship by the RWTH Aachen University. In his dissertation, André dealt with user-centered development and evaluation of a small-screen device for diabetes patients.

Since 2013, André has been working as a post-doctoral fellow at RWTH Aachen University and deals with the interface between algorithms and humans in different application areas. He works in the fields of empirical social research, technology acceptance, eHeatlh, industry 4.0, recommendation systems, information visualization and social media.

Since 2014 André is visiting professor at the Medical University Graz at the HCI-KDD Group with Prof. Dr. Andreas Holzinger, where his research focuses on the integration of computerized methods and machine learning in health care.

Since 2018 André is the research group leader of the junior research group “Digitale Mündigkeit”. In this research group, the interaction of recommendation algorithms, social bots, and fake news in social media are investigated.


  • Human-Computer Interaction
  • Information Visualization
  • Recommender Systems
  • Data Science
  • Industry 4.0
  • Machine Learning
  • Social Networks
  • Technology Acceptance


  • PhD in Psychology (Dr. phil.), 2013

    RWTH Aachen University

  • Dipl.-Inform in Computer Science, 2007

    RWTH Aachen University


Recent Posts

Masken für alle? Die Wissenschaft sagt ja.

Übersetzt: André Calero Valdez (+ DeepL). Soll man nun Masken tragen oder nicht? Sicher, es ist kompliziert. Aber nicht so kompliziert, wie manche Leute unterstellen. Wir haben uns die Forschung angeschaut (siehe unsere Veröffentlichungen “Face Masks Against COVID-19: An Evidence Review” - mit 84 Referenzen! - und “Face masks for the public during the covid-19 crisis”). Hier ist eine Zusammenfassung der verschiedenen Evidenzströme und unsere Einschätzung, was das alles bedeutet.

Using Netlogo for Disease Modeling

Overview Since the term “Simulation” or modeling was used frequently in the media recently to get an understanding of the spread of covid-19, I have created an instructive agent-based model for the simulation of disease spread and limited hospital capacities. Since this model is only “instructive” for the purpose of understanding modeling, I have also created a video to explain the model and some implications due to the simplicity of the design.

Testing regular expressions with regexr.com

The website regexr.com provides a well developed tool for testing regular expression on the fly. Even better, it has a set of working patterns and lets you store your own patterns for later reuse. I highly recommend to test it: https://regexr.com/

Using the apastats package to write reproducible reports

Overview Writing a research report using RMarkdown allows you to start your analysis even before you have collected the data. This is especially helpful in report writing and thesis writing. When you, web-crawler, or a panel are still collecting data, you can already start writing the thesis. However, writing results before having the data is somewhat challenging. Keep in mind that writing a discussion before having collected the data is a lot harder.

rmdtemplates package update

Today I updated the rmdtemplates package on github. It now supports PocketMods: Tiny little 8 paged books that you can now author in Markdown.

Check it out at http://www.github.com/statisticsforsocialscience/rmd_templates


Funded Research Projects


Funded by the RWTH digitization of teaching fund.


Funded by the BMBF. Funding period: 2018-2020

Digitale Mündigkeit

Junior Research Group funded by the NRW State Government. Project runtime from 2018 to 2022.

Cyber - Space Perception in Cyberspace

Funded by the ICT Foundations of a Digitized Industry, Economy, and Society” by the profile area ICT. Funding Period: 2016-2017

iNec - Innovation by Expert Communities in Times of Demographic Change

Funded by the BMBF. I have worked in this project from 2012 to 2015.

Cluster of Excellence - Production Technology in High-Wage Countries

Funded by the DFG and ther German Federal and State Governments. Between 2012-2017, I have worked in this project in the …

Dissertation - Technology Acceptance and Diabetes

User-Centered Design of Small Screen Devices for Diabetes Patients. My dissertation projected funded by the RWTH Aachen University …

Recent & Upcoming Talks

Human-Algorithm Interaction at Dataviscamp 2020

Dataviscamp is a new initiative with focus on datavisualization: We bridge the gap between data and humans.

e-Coaching the Elderly Recommender Systems in Health

Plenary Session

Recent Publications

Quickly discover relevant content by filtering publications.

Computational Methods in Professional Communication

The digitization of the world has also led to a digitization of communication processes. Traditional research methods fall short in …

Hey, Siri, Ok, Google, Alexa. Acceptance-Relevant Factors of Virtual Voice-Assistants

Today, virtual voice-assistants are used for manifold purposes. Besides their promising potential, many users are concerned about their …

Trust in Cyber Security Recommendations

Over the last two decades, the Internet has established itself as part of everyday life. With the recent invention of Social Media, the …

Would I Lie to You? How Users Evaluate Faked Online Content Depending on Its Publication Type

Since the unexpected outcome of the 2016 US elections and the Brexit referendum, the term fake news mutated to an almost daily …

Bubble Trouble: Strategies Against Filter Bubbles in Online Social Networks

In the recent past, some electoral decisions have gone against the pre-election expectations, what led to greater emphasis on social …


List of Courses and Seminars

Teaching information will be added soon. A list of all courses can be found here.