{"id":154413,"date":"2026-08-02T12:28:35","date_gmt":"2026-08-02T12:28:35","guid":{"rendered":"https:\/\/www.mauriziolacava.com\/?p=154413"},"modified":"2026-08-02T18:05:06","modified_gmt":"2026-08-02T18:05:06","slug":"coxcomb-chart-complete-guide","status":"publish","type":"post","link":"https:\/\/www.mauriziolacava.com\/en\/coxcomb-chart-complete-guide\/","title":{"rendered":"Coxcomb Chart: the complete guide to the chart that saved thousands of lives (and how to build one in seconds)"},"content":{"rendered":"\n
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\"Coxcomb<\/figure>\n\n\n\n
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Key Takeaways:<\/strong><\/p>\n\n\n\n

•  A coxcomb chart inverts the pie. <\/strong>Constant angle, variable radius, which frees the circle to carry a cycle instead of a set of proportions.<\/p>\n\n\n\n

•  Florence Nightingale invented it to be understood in one glance. <\/strong>Her 850 page report was filed and ignored. A single diagram changed British public health.<\/p>\n\n\n\n

•  Area is the honest encoding. <\/strong>If the radius is proportional to the value the chart exaggerates. The square root is the correct scaling, and it is the check to run on any coxcomb tool.<\/p>\n\n\n\n

•  It wins on shape and loses on precision. <\/strong>Choose the coxcomb when the distribution is the message, and a bar chart when the exact comparison is.<\/p>\n\n\n\n

•  The PowerPoint export is what makes it usable at work. <\/strong>Native editable shapes travel into any deck, while a flat image does not survive the first revision.<\/p>\n\n\n\n

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<\/span>Introduction<\/span><\/h2>\n\n\n\n

Some charts changed the way we look at the world. One of them did something else entirely, because it saved thousands of human lives. It is called a coxcomb chart, it was drawn for the first time in 1858 by a nurse working with military mortality data, and it still solves a problem that most people presenting numbers have never framed properly.<\/p>\n\n\n\n

This guide covers the whole subject in one place. What a coxcomb chart is and what separates it from a pie chart, where it comes from and why it worked when 850 pages of evidence did not, how to read one without falling into the trap that ruins most modern versions, when it is the right choice and when it is the wrong one, and how to build your own in about a minute with the free coxcomb chart maker<\/a> I designed for exactly this purpose. Every step carries the screenshot of the screen you will see, so the guide stands on its own even if you never press play. If you would rather watch, the video below tells the story in four minutes.<\/p>\n\n\n\n

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