Archive for data graphics

terrible graphs [not a joke]

Posted in Statistics with tags , , , , , , , on April 1, 2026 by xi'an


Following the results of the local (municipal) elections, Le Monde published a series of graphs, most of which are terrible. The one above produces the political colour of the winning mayor (when identified) from the previous elections to the current one. With the flows linking 2020 and 2026 solely decorative. And hiding the serious increase in extreme right city halls. The one below is even worse as it has bars for each party adding the second round voters to the first round voters, albeit they are mostly the same! And as they are not proportional to the number of secured city halls since there are more right wing ones than left wing halls…

mappa grafica [book (re)view(s)]

Posted in Books, pictures, Travel with tags , , , , , , , , , , on April 15, 2025 by xi'an

warming stripes [but 1d]

Posted in Kids, pictures, Statistics, Travel with tags , , , , , , , , , , , on April 15, 2024 by xi'an

Just recently, I came across this representation of the (global) temperature rise over the period 1850-2020, made by Professor Ed Hawkins from the University of Reading. It is powerful, artsy, reminding me of the Everything mural in the Zeeman Building at the University of Warwick, and visually most appealing, as a poster about the urgency for action, but it nonetheless remain a poor statistical graph in that it is a 2d presentation of a 1d dataset, the time series of the yearly average temperatures, missing the opportunity to exploit the second axis by eg taking a stripe of the Earth from South Pole to North Pole or the daily temperature throughout the year. And it is also lacking a scale, not only by omitting the dates on the first axis, but also by choosing an arbitrary if dramatic colour range [unable to incorporate the so-far ultimate 2023?!] (And with the visual appeal comes the danger of turning it into yet another marketing gimmick, hence cancelling its message.)

max spacing between mass shootings [data graphics]

Posted in Books, R, Statistics with tags , , , , , , , , , on January 11, 2024 by xi'an

missing dimensions

Posted in Statistics with tags , , , , , , , , , , , , , on February 14, 2021 by xi'an