{"id":2367,"date":"2020-12-18T22:42:23","date_gmt":"2020-12-19T06:42:23","guid":{"rendered":"https:\/\/www.lightsondata.com\/?post_type=tva_lesson&#038;p=2367"},"modified":"2020-12-18T22:48:44","modified_gmt":"2020-12-19T06:48:44","slug":"pie-chart","status":"publish","type":"tva_lesson","link":"https:\/\/www.lightsondata.com\/course\/pie-chart\/","title":{"rendered":"Pie Chart"},"content":{"rendered":"<h2><strong>Definition<\/strong><\/h2>\n<p>A pie chart expresses a part-to-whole relationship in your data. A pie chart is a type of graph which displays data in a circular graph. Imagine an actual pie which represents 100 per cent of a whole.<\/p>\n<p>The pie chart is also called:<\/p>\n<ul>\n<li>A pizza chart<\/li>\n<li>A Camembert chart<\/li>\n<li>A cake chart<\/li>\n<\/ul>\n<h2><strong>Usage and Misusage of the Pie Chart<\/strong><\/h2>\n<p><strong>How size of pie chart slices get interpreted<\/strong><\/p>\n<ol>\n<li>By its angle<\/li>\n<li>By its arch length or area: <a href=\"https:\/\/eagereyes.org\/blog\/2016\/an-illustrated-tour-of-the-pie-chart-study-results\" target=\"_blank\" style=\"outline: none;\" rel=\"noopener\">An illustrated tour of the pie chart study results<\/a><\/li>\n<\/ol>\n<p><strong>Use the pie chart if you want to<\/strong><\/p>\n<ul>\n<li>Show a part-to-whole relationship<\/li>\n<li>Show your audience some rough proportions of what that whole, that 100% is split into<\/li>\n<li>Convey that one portion of the total is relatively large\/ small<\/li>\n<\/ul>\n<p><strong>Don&#8217;t use the pie chart if<\/strong><\/p>\n<p>1. You&#8217;ve answered YES to these questions:<\/p>\n<ul>\n<li>Are you using any negative values?<\/li>\n<li>Are you using more than one data series?<\/li>\n<li>Do you need to represent the Zero value?<\/li>\n<li>Do you have more than 5 categories?<\/li>\n<li>Do you want to compare the parts to each other?<\/li>\n<\/ul>\n<p>2. You&#8217;ve answered NO to these questions:<\/p>\n<ul>\n<li>Do the parts make a meaningful whole?<\/li>\n<li>Are the parts mutually exclusive?<\/li>\n<\/ul>\n<h1 style=\"text-align: center;\"><strong>Remember to<\/strong><\/h1>\n<p style=\"text-align: left;\">Use pie charts if you want to show a part-to-whole relationship and show your audience some <span style=\"text-decoration: underline;\">rough<\/span> proportions of that whole. Don&#8217;t use it if you need your readers to accurately read the proportions or compare those proportions with one another.<\/p>\n<h2><strong>History of the Bar Graph<\/strong><\/h2>\n<p>In 1801 Scottish engineer and political economist William Playfair published in London <em><a href=\"http:\/\/books.google.com\/books?id=Y4wBAAAAQAAJ&amp;printsec=frontcover&amp;source=gbs_ge_summary_r&amp;cad=0#v=onepage&amp;q&amp;f=false\" target=\"_blank\" rel=\"noopener\">The Statistical Breviary<\/a>; <\/em>Shewing, on a Principle Entirely New, the Resources of Every State and Kingdom in Europe. William Playfair represents the physical powers of different distinct nations through the usage of pie charts.<\/p>\n<h2><strong>Types and Variants of Pie Charts<\/strong><\/h2>\n<ul>\n<li>Exploded pie chart<\/li>\n<li>Donut chart<\/li>\n<li>Polar area diagram<\/li>\n<li>Spy chart<\/li>\n<li>Ring\/ sunburst\/ multi-level pie chart<\/li>\n<li>Spider\/ radar chart<\/li>\n<\/ul>\n<h2><strong>Visualization Best Practices<\/strong><\/h2>\n<p><strong>Color<\/strong><\/p>\n<ul>\n<li>Pick a <a href=\"https:\/\/www.lightsondata.com\/course\/color-accessibility-and-resources\/\" target=\"_blank\" rel=\"nofollow noopener\">color<\/a> and use its different shades for the pie slices, sans the slice you want to emphasize<\/li>\n<li>Stay away from using rainbow colors<\/li>\n<\/ul>\n<p><strong>Labels<\/strong><\/p>\n<ul>\n<li>Label smaller pie slices outside of the chart<\/li>\n<li>You can include both the absolute values or their relative proportions<\/li>\n<\/ul>\n<h3 style=\"text-align: center;\">Do<\/h3>\n<ul>\n<li><span>Use 5 or less categories<\/span><\/li>\n<li><span>Choose labels over legend<\/span><\/li>\n<li><span>Order pie slices based on their size<\/span><\/li>\n<li><span>Color pie slices with different shades of the same color, sans the slice you want to emphasize<\/span><\/li>\n<li><span>Add category&#8217;s name to data label and its percentage<\/span><\/li>\n<li><span>Label smaller pie slices outside of the chart<\/span><\/li>\n<li><span>Consider grouping smaller slices together in one bigger slice<\/span><\/li>\n<\/ul>\n<p>\u200b<\/p>\n<h3 style=\"text-align: center;\">Don&#8217;t<\/h3>\n<ul>\n<li><span>Use more than 5 categories<\/span><\/li>\n<li><span>Compare pie charts with each other&nbsp;<\/span><\/li>\n<li><span>Use rainbow colors<\/span><\/li>\n<li><span>Use a 3D pie chart<\/span><\/li>\n<li><span>Order slices based on the category name<\/span><\/li>\n<li><span>Disproportionate the pie slices in reference to their corresponding value<\/span><\/li>\n<li><span>Use them to accurately show proportions<\/span><\/li>\n<\/ul>\n<h2>References<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.geckoboard.com\/blog\/pie-charts\/\" target=\"_blank\" rel=\"nofollow noopener\" style=\"outline: none;\">The case against the pie chart<\/a><\/li>\n<li><a href=\"https:\/\/www.businessinsider.com\/pie-charts-are-the-worst-2013-6\" target=\"_blank\" rel=\"nofollow noopener\" style=\"outline: none;\">The worst chart in the world<\/a><\/li>\n<li>\u200b<a href=\"https:\/\/bernardmarr.com\/default.asp?contentID=1779\" target=\"_blank\" rel=\"nofollow noopener\" style=\"outline: none;\">Why you shouldn&#8217;t use pie charts In your dashboards and performance reports<\/a><\/li>\n<li><a href=\"https:\/\/towardsdatascience.com\/pie-charts-considered-harmful-36268a4e42e6\" target=\"_blank\" rel=\"nofollow noopener\" style=\"outline: none;\">Pie charts considered harmful<\/a><\/li>\n<li><a href=\"https:\/\/www.data-to-viz.com\/caveat\/pie.html\" target=\"_blank\" rel=\"nofollow noopener\">The issue with pie chart<\/a><\/li>\n<li><a href=\"https:\/\/eagereyes.org\/criticism\/march-chart-madness\" target=\"_blank\" rel=\"nofollow noopener\">The worst pie chart ever<\/a><\/li>\n<li><a href=\"https:\/\/ilovecharts.tumblr.com\/post\/42856828971\/re-worst-pie-chart-of-2013-could-have-been\" target=\"_blank\" rel=\"nofollow noopener\" style=\"outline: none;\">The worst pie chart of 2013<\/a><\/li>\n<li>Stephen Few&#8217;s <a href=\"http:\/\/www.perceptualedge.com\/articles\/visual_business_intelligence\/save_the_pies_for_dessert.pdf\" target=\"_blank\" rel=\"nofollow noopener\">&#8220;Save the pies for desert&#8221;<\/a><\/li>\n<\/ul>\n","protected":false},"template":"","class_list":["post-2367","tva_lesson","type-tva_lesson","status-publish","hentry","tva_courses-data-visualization-for-data-storytelling","post-wrapper","thrv_wrapper"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.4 - 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