network analysis. social media. natural language processing. data visualization. web apps.

1st Twitter Mix Days, April 2015 in Lyon

Visit the conference website

The Twitter Mix Days organized by EMLYON Business School bring together developers, professionals and researchers to share the latest developments around Twitter: latest apps, frameworks and academic results obtained using Twitter.

120 participants joined for this first edition that took place in Lyon. I chaired the event.

Les calanques sont elles ouvertes?

try this app - check the code

Calanques are tiny, beautiful creeks on the Mediterranean sea. Their access can be closed because of weather conditions. Check this site to know if they open.

neuromarketing Forbes cover Neuromarketing: a timeline

visit the timeline - read the paper (in submission)

Neuromarketing is an emerging field connecting marketing and neuroscience. At the frontier between an academic research field and new business practices in market research. With Profs. Paul Wouters and Ale Smidts, we investigated the history of neuromarketing for the years 2002 - 2008. To write this history, we used a collection of documents mentioning "neuromarketing", in online and offline media, harvested by (at the time) research assistant Nicoline Beun.

This timeline illustrates key episodes in this history.
Real Time Opinion

try this app - check the code

This web app gives real time feedback from the audience during a lecture or a conference. Give a session code to the audience, and see how they vote: bored, following, or interested. The total of the votes is shown as a gauge. So, is your lecture interesting or not?

Give color to your nodes

get the plugin - check the code

This plugin gives you full control on the color of your nodes in Gephi. Add a node attribute that has RGB or #hex values, click on the color wheel icon, and all your nodes will be colored as you specified.

Converter of Excel files (and csv) to networks in Gephi

get the plugin - check the code

A free plugin for Gephi which converts your Excel and csv files into networks, directly visible with Gephi.

Map of Countries: add country borders as background to Gephi

get the plugin - check the code

You can now load countries, continents or the entire world as background maps to your networks. Very useful for geolocalized networks.

Force Atlas 3D: visualize networks in 3D with Gephi

get the plugin - check the code

Force Atlas 3D projects networks on the screen using the 3 dimensions available (x, y, z). This results in new configurations, revealing the structure of the network in novel ways. The plugin can be downloaded directly from wtihin Gephi.

Eonydis: create dynamic networks

visit the wiki - check the code

download eonydis

Note: Eonydis is deprecated. Use the "Excel / csv network Converter" (a plugin for Gephi) instead. This plugin can create dynamic networks.

Take your timestamped data from Excel of csv files and transform them into a dynamic network you can visualize with Gephi.

Gaze: find structure in your networks

visit the wiki - watch the Youtube video - check the code

download gaze

General purpose tool to create networks based on the similarity between objects. An answer to your question: "How do I get my Excel tables into a network?"

May 2013: Gaze has been updated with a progess bar and a log window to spot errors.

Umigon: sentiment analysis on Twitter

read the paper - check the code

visit the website of Umigon

Umigon is developed since December 2012 as a web application providing a service of sentiment detection in tweets. It has been designed to be fast and scalable. Umigon also provides indications for additional semantic features present in the tweets, such as time indications or markers of subjectivity.

Umigon is now available as a desktop application for Mac, PC and Linux. Contact me at clevallois[at]rsm.nl for information about licenses.

Philosophy, visualized: a conversation with Blake Thompson

watch the videos

Blake Thompson is a philosopher. He worked with artist Matt Leavitt on how to give a visual form to a philosophical argument. During a visit in Leiden, we walked to the Burcht and Blake answered a series of questions on this project.

Cowo: create semantic maps from your texts

visit the wiki - check the code

download cowo

Cowo takes a text (.txt file) and transforms it into a semantic map where the most frequent terms are clustered according to their co-ocurrences.

The 90 year anniversary of the Harvard Business Review - a data visualization for Kaggle

with Valerie Alloix

check the submission on Kaggle

download the full-sized poster

Alphabetical sorter - a plugin for Gephi

installation instructions

This plugin for Gephi distributes the nodes according to the alphabetical order of their labels. I created this little plugin to layout isolated nodes properly, instead of having them floating around in a mess.

A map of the #dataviz community on Twitter in 2012

visit the interactive map

This map shows who is connected with whom in the dataviz community on Twitter, in 2012. A connection between 2 persons reflects their high similarity in terms of who they tend to mention in their tweets, not the fact that they are mentioning each other. This effect is obtained with Gaze, a software I created that you can find and download from this page.

The circle of co-authors of Pr. Frans van den Bosch

Visit the project

This is an evening project created in 2012 at the occasion of a symposium honoring Pr. Frans van den Bosch, a professor at Rotterdam School of Management. It shows all the co-authors of the professor, with the thickness of links corresponding to the number of co-authored publications.