Slopegraphs

Charlie Park skreiv i juli 2011 om Edward Tufte sine «Slopegraphs» (les innlegget her). Han innleiar med dette:

It’s curious that it hasn’t become more popular, as the chart type is quite elegant and aligns with all of Tufte’s best practices for data visualization, and was created by the master of information design. Why haven’t these charts (christened “slopegraphs” by Tufte about a month ago) taken off the way sparklines did?

In this post, we’re going to look at slopegraphs — what they are, how they’re made, why they haven’t seen a massive uptake so far, and why I think they’re about to become much more popular in the near future.


Tufte, Edward. The Visual Display of Quantitative Information.
Cheshire, Connecticut: Graphics Press; 1983; p. 158

Han skriv om:
– Kvifor han trur denne diagramtypen ikkje har vorte meir populær (komplisert, ny og fram til nyleg namnlaus)
– Kjenneteikna på slopegraphs (It’s like a super-close zoom-in on a line chart, with a little extra labeling)
– Kva program du kan bruke for å lage din eigen slopegraph
– Når dei er gode å bruke(Any time you’d use a line chart to show a progression of univariate data among multiple actors over time, you might have a good candidate for a slopegraph, eller som Tufte sjøl seier: Slopegraphs compare changes over time for a list of nouns located on an ordinal or interval scale)
– Tips og triks om korleis ein kan lage ein god slopegraph
– 4 Case Studies (Ben Fry’s Baseball ChartThe National Geographic Magazine Life-Expectancy Chart, WindingRoad.com Speed Per Dollar og Edward Tufte’s & Kindly Contributor Dave Nash’s Cancer Survival Rates)

Mange vart involvert i debatten om slopegraphs, noko som gjorde at Charlie Park skreiv ei oppdatering i desember:

Nat Torkington frå O’Reilly’s Radar har ei god beskriving av slopegraphs: [slopegraphs convey] rank, value, and delta over time.

I oppdateringa skriv Charlie om:

Diagram som liknar på slopegraphs («Bumps Charts» (So are bumps charts slopegraphs? Absolutely. Are slopegraphs bumps charts? Not always. I would draw the Venn circle for bumps charts as completely contained within the larger Venn circle of slopegraphs), «Parallel Coordinate Plots» (So are parallel coordinate plots slopegraphs? Generally, I’d say they aren’t. Why? In most PCPs, the slope across the entire chart carries no meaning. The line is there only to aid your eye in tracking an individual agent’s values across the chart. Switching the order of the columns – and changing their slope – doesn’t change the general outcome of the chart.) og «Ladder Graphs» (The key distinction between the two: A ladder graph compares the forced ranking of multiple variables among two groups. A slopegraph, though, would be a good candidate for showing “a progression of univariate data among multiple actors over time”))
Fleire eksempel på bruk av slopegraphs
Whiskerslopes (skapt av Mike Stone): om korleis ein kan handtere overlappande etikettar
Fleire tips & triks (if you have multiple comparisons (as in the cancer slopegraph), maintain a consistent scale for the horizontal alignment of your columns, be clear about whether the “comparison point” on the chart isthe end of the slope line or the data label itself og determine whether you want to highlight the absolute rate of change or the fractional rate of change)

Finn eksempel på diagram på  Junk Charts og på ProcessTrends.com

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