line chart

1 posts
Charting the Korean War’s Missing Troops

I wrote recently about the effort to get North Korea to return some of the remains of United States troops who are still unaccounted for since the Korean War. More than 7,000 troops — almost all presumed dead — never came home after the conflict, which ended with an armistice in 1953. There’s new hope that recent diplomacy between the United States and North Korea might allow some of those remains...

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Headless people invade London, chart claims

Some 10 days ago, Mike B. on Twitter forwarded me this chart from Time Out: Mike added: "Wow, decapitations in London have really gone up!" A closer look at the chart reveals more problems. The axis labels are in the wrong places. It appears that the second dot represents 1940 and the second-last dot represents 2020. There are 12 dots between those two labels, corresponding to three evenly-spaced labels. This...

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China’s Imbalanced Trade with the United States, in Four Charts

A trade war could be looming between the United States and China, fueled by President Trump’s fixation on the two nations’ unbalanced import-export relationship. The trade imbalance between the two countries — which might not hurt the United States that much — stems from the fact that China sells more to us than it buys, essentially. That’s largely driven by macroeconomic factors, not some malicious intent: China is a low-cost manufacturing powerhouse,...

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Several problems with stacked bar charts, as demonstrated by a Delta chart designer

In the Trifecta Checkup (link), I like to see the Question and the Visual work well together. Sometimes, you have a nice message but you just pick the wrong Visual. An example is the following stacked column chart, used in an investor presentation by Delta. From what I can tell, the five types of aircraft are divided into RJ (regional jet) and others (perhaps, larger jets). With each of those...

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The tech world in which everyone is below average

Laura pointed me to an infographic about tech worker salaries in major tech hubs (link). What's wrong with this map? The box "Global average" is doubly false. It is not global, and it is not the average! The only non-American cities included in this survey are Toronto, Paris and London. The only city with average salary above the "Global average" is San Francisco Bay Area. Since the Bay Area does...

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How China’s Economic Retaliation Hurt the South Korean Tourism Industry

I wrote this week about the one-year anniversary of China’s economic retaliation against South Korea over the THAAD missile system, a defensive weapon designed to stop North Korea’s medium-range missiles. China objects to it and has been flexing its economic muscle in protest, carrying out an aggressive campaign of economic retaliation that includes sending fewer tourists. In 2017, just over 4 million Chinese visited South Korea, down from roughly 8...

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Saying no thanks to a box of donuts

As I reported last week, the Department of Education for Delaware is running a survey on dashboard design. The survey link is here. One of the charts being evaluated is a box of donuts, as shown below: I have written before about the problem with donut charts (see here). A box of donuts is worse than one donut. Here, each donut references a school year. The composition by race/ethnicity of...

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Why line charts are better than area charts

I saw this chart on Business Insider recently: This links to Market Insider, where there is a tool to make different types of charts. Despite the huge drop depicted above, by last week, the Dow Jones index has recovered to the level at the start of 2018: The same chart can be made as an area chart (called a "mountain chart" by Market Insider). The painting of the area serves...

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Looking above the waist, dataviz style

I came across this chart on NYU's twitter feed.  Growth has indeed been impressive; the dataviz less so. Here's the problem with not starting the vertical scale of a column chart at zero: In a column chart, the heights of the columns should be proportional to the data. Here they are misaligned because an equal amount has been chopped off below 30,000 from all columns. The light purple that I...

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It’s Been a Hot Summer, Down Under

My family is vacationing this week in Mosman, Australia, a harbourside Sydney suburb near Balmoral Beach known for its family friendly attractions and boutique shops. This place is a great holiday spot. There’s only one problem this year, though: It’s been quite hot. Sydney is normally relatively temperate during the summers, which occur opposite winters in the Northern Hemisphere. The average temperature in Celsius this time of year usually runs...

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