By Graham Wills

ISBN-10: 038777906X

ISBN-13: 9780387779065

Art, or technological know-how? Which of those is how to examine the sphere of visualization? this isn't a simple query to reply to, even if you happen to have decades adventure in making graphical depictions of information with a purpose to support humans realize it and take motion. during this ebook, Graham Wills bridges the space among the paintings and the technology of visually representing facts. He doesn't easily provide principles and suggestion, yet bases those on normal ideas and supply a transparent direction among them

This publication is anxious with the graphical illustration of time facts and is written to hide a variety of diverse clients. A visualization professional designing instruments for showing time will locate it beneficial, yet so additionally may still a financier assembling a file in a spreadsheet, or a clinical researcher attempting to reveal gene sequences utilizing a advertisement statistical package.

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**Extra resources for Visualizing Time: Designing Graphical Representations for Statistical Data**

**Sample text**

2 Elements 31 125 600,000 500,000 400,000 300,000 200,000 100,000 0 100 75 50 25 0 15:45 16:00 16:15 16:30 16:45 17:00 17:15 Fig. 7 Histogram of trade times. This figure is similar to Fig. 6, but we have colored each bar by the sum of trade volumes in each bar. m. m. (local time) the time period just after this period saw more total trade volume a bar chart. While the advice is not bad advice when stated as a general guideline, be aware that it is not a universal rule – there are important exceptions.

Instead, consider if zero really is meaningful for your data and if it is important to be able to compare lengths. In most cases, the answer is yes and the advice is good, but, like all advice, do not follow it slavishly. Zero may not be a good baseline. Consider a chart where x represents buildings in Chicago and y the altitude of their roofs as measured above sea level (a subject of some interest to the author as he types this on a windy day in the Sears Tower). A more natural baseline than zero would be the average altitude of the city itself, so the heights of the bars would more closely approximate the heights of the buildings themselves.

In this language, a scatterplot consists of two variables placed in a 2-D rectangular coordinate system with axes as guides and represented by a point element. A bar chart of counts consists of a single variable representing categories, placed in a 2-D rectangular coordinate system with axes as guides and represented by an interval element with a count statistic. Because the grammar allows us to compose parts in a mostly orthogonal manner, one important way we can make a modification to a visualization is by modifying one of the parts of the grammar and seeing how it changes the presentation of the data.

### Visualizing Time: Designing Graphical Representations for Statistical Data by Graham Wills

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