December 2024
Intermediate to advanced
576 pages
12h 58m
English
Content preview from Data Visualization in R and Python
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10Ridgeline Plots
10.1 History of the Ridgeline
The ridgeline plot is a peculiar type of graphic with a curious history intersecting that of an iconic image, the one presented on the cover of the (once renowned) UK band Joy Division’s first album, Unknown Pleasures (1979). The origin of that image has been researched for long by music fans until the definitive explanation was found. It is the white-on-black representation of the 80 pulsations of the first observed pulsar star, named PSR B1919+21 (originally called CP1919 and first observed by Jocelyn Bell Burnell in 1967, at time a Ph.D. student at Cambridge University, UK), vertically aligned one over the other. The original image (Figure 10.1) first appeared in the 1970’s Ph.D. thesis of Harold D. Craft, Jr. and in the journal Scientific American, which also published that image in 1970, summarized the whole story by interviewing the author, at time a student at Cornell University, now Professor Emeritus at the same university (https://blogs.scientificamerican.com/sa-visual/pop-culture-pulsar-origin-story-of-joy-division-s-unknown-pleasures-album-cover-video/).
The ingenious idea of showing those star pulsations on top of each other to highlight the frequency variations is the same that inspires the ridgeline plot where, in place of electromagnetic pulsations, there are density plots showing the different value distributions for a set of observations.
The expected visual effect is to compare similar observations collected ...
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