![]() ![]() This helps you draw comparisons quicker than the traditional method.Īnother variation to dual bar charts is what’s known as a stacked double bar graph. Instead of placing bars side-by-side, this type of bar chart has them moving away from one another. The other advantage is in creating a divergent double bar chart. Horizontal double bar graphs allow you to list longer labels because the categories are oriented how we naturally read text. This may seem like a minor issue, but if you have a lot of categories or want to present a clean, professional chart, the horizontal bar graph can be a savior. While there are ways around this, like staggering the labels or having them at an angle, it can still look messy. If your titles are too long, it becomes a jumbled mess. In a vertical data representation, you have limited space to name each bar pair. Horizontal double bar graphs aren’t the most popular choice, but they do have their advantages. This is the reverse of a vertical bar chart, where your data items appear along the X-axis and the count metric appears on the Y. Meanwhile, your bar pairs themselves list along the Y-axis. The longer a bar extends from right to left, the more value or frequency that particular item has. In a horizontal bar chart, the X-axis shows your count data. The only difference between these two types of bar charts is how the pictorial depictions of your data appear. The first distinction is between a horizontal double bar graph and a vertical one. To have a complete understanding of what a double bar graph is, it’s essential to identify the different types of bar graphs used in visual data storytelling. This enables the chart maker to visualize two variables or sets of data with one chart. The only difference between a bar chart and a double bar graph is the latter shows two bars for each category. With this visualization, the team can see how much performance improved and which pages still need attention.ĭouble bar graphs utilize a horizontal axis and vertical axis, or X-Y plot, to measure the magnitude or value of each bar.Įssentially, if you’re familiar with a bar chart, you can easily understand a double bar chart because it is very similar. The height of each bar shows its performance for that particular page and period. Each pair of bars represents a page on the site and the two individual bars within that pair show page traffic before and after the redesign. In the double bar graph, the two bars show the same thing in two separate ways.įor example, your team redesigns the company website and wants to evaluate the performance of each page. Every bar represents a particular item in your data set. ![]() People typically use bar charts and double bar graphs to show categorical data. The double bar graph is a pictorial representation of data that uses vertical or horizontal rectangles to reflect different items in your data set. At best guess, multi-bar charts started appearing sometime in the 1800s. It wouldn’t take long for people to recognize the power of the double bar graph in comparison. ![]() So, we know that people were already conducting visual comparative analyses. Some forms of comparison visualizations appeared even before Playfair’s published bar chart in 1786. History is a little murky on when exactly the first dual bar chart appeared or who invented it. Soon, people began introducing variations to Playfair’s original bar chart, including the double bar graph. It wouldn’t take long for these visualizations to become commonplace in statistics. (He would publish another piece a couple of years later that offered the first look at pie and circle charts).Īt the time for statistics, this was like a prehistoric human returning to his tribe with fire and the wheel. However, within this publication, Playfair introduced the first bar charts and line graphs. This exhaustive and monotonous title wouldn’t interest most. To which are Added Charts of the Revenue and Debts of Ireland, Done in the Same Manner by James Correy. In 1786, Playfair published The Commercial and Political Atlas Representing, by Means of Stained Copper-Plate Charts, the Exports, Imports, and General Trade of England, at a Single View. To tell this story, we need to talk about William Playfair - the inventor of many chart types, including the bar graph. The history of the double bar graph is really the background story of bar charts in general.
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