This follows up on the four dimensions in two dimensions post. I updated the graph adding some functionality, increasing the readability and improving the aesthetics. Moreover, the plot can now transition from a visualization with two categorical variables to one with four. The principle guiding the creation of the graph remains the same: to display as much information as possible into a two-dimensional graph without sacrificing interpretability and maintaining (hopefully) pleasing aesthetics. Because of the addition of the transition effect, I thought it was like adding a new dimension to the four which already existed. Below I describe the implementation of these additions. The graph is made in d3.js and the final plot can be admired here.
I wrote this text for my Dutch class. The assignment was to write a text describing a personal experience including some research. It was not meant to be a psychoanalysis session: no research on the personal experience itself. In some sense, the assignment was to write a report, such as a visit to a city, including details on the city’s history, or something along those lines. Recently, I did not visit a city of which I would have like to deepen into its history, art extravaganza or whatnot. However, last week-end I cleaned our moka, the essential coffee percolator in every Italian household. The moka was the perfect subject for this (Dutch-writing) assignment.
Continue reading “Moka”
This post is the third in the series describing the web-interface I created to administer a questionnaire with the Delphi method. In this post I describe the code used to give feedback to the participants in round 2 of the Delphi study on functional magnetic resonance imaging on tinnitus. If you are interested in the previous posts, this post describes the interface for round 1 whereas this post describes (the first part of) the interface for round 2.
Continue reading “Web-interface for Delphi Method III”
This post describes the web-interface I built for the second round of the Delphi method study on functional magnetic resonance imaging and tinnitus. In the second round, the experts who participated in the first round saw the responses that they gave to the first round side-by-side with the responses of all the other experts. As represented in the figure above, in round 2 the Delphi interface displayed one question and two bar plots showing the distribution of experts’ responses for the given question in round 1. To keep the post short and to the point, I divided the description of the interface for round 2 into two parts.
Continue reading “Web-interface for Delphi Method II”
I recently worked on a fun project at work. I developed a web-interface for administering a questionnaire using the Delphi method. The Delphi method aims to bring consensus on a given topic using a concept similar to ‘the wisdom of crowds‘.
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Because lately I have been writing too often about serious stuff, today I will share the result of another type of experiments: the recipe of my favorite pizza dough. I have been experimenting making my own pizza dough for the last three years and I believe I have now found a recipe which yields a good result. The recipe distills and combines the wisdom of three very positive influences, Dan Leppard, Emmanuel Hadjiandreou, and il cucchiaio d’argento.
Continue reading “My favorite pizza dough”
This post is an update on the previous post translating Byron and Wattenberg’s streamgraphs algorithm into R. Byron and Wattenberg’s algorithm produces beautiful streamgraphs with the synthetic data produced by their streams generator. However, the implementation yields an ugly streamgraph when applied to data which might not be as wiggly as the synthetic ones. In the attempts I made I got very peaky wiggles, not smoothed and irregular. In short the graphs did not transmit the idea of a stream, but of a blurry blob or a peaky primitive bat (the wooden club, not the animal, that would be cool!). In this post I bring-up some points to bear in mind when producing a streamgraph. Continue reading “Streamgraph in R [final]”