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December 28th, 2014, 07:35 PM   #1
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[Box Plot] Got Confused by My Textbook (Again)

Still writing a book about tables and diagrams. Now I am preparing to do a box plot sub-chapter. However, I find some difficulties here. In my reference book, it says that the values lie in both ends are outliers. Then I did some research on the web. Almost all of them told that those values on both ends are the lowest and highest data, respectively. Which one is correct? Not to mention, among 4 of reference books available in the office, that book is the only one which tells about box plot while the other three don't even touch it at all. Please help me in this matter. Thanks in advance.
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December 28th, 2014, 09:41 PM   #2
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Still writing a book about tables and diagrams. Now I am preparing to do a box plot sub-chapter...
The most basic box plot has the ends of the whiskers at the largest and smallest values in the data, the other common form has the whiskers extending to the lowest/highest data point within 1.5 times the IQR of the lower/upper quartile with the data outside the whiskers shown individually as outliers.

You will find all of this and more types on the box plot Wikipedia page.

CB
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December 29th, 2014, 05:42 AM   #3
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And so, which one should I explain in the book regarding the ends?
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December 29th, 2014, 08:22 PM   #4
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And so, which one should I explain in the book regarding the ends?
Which ever you or your readers are going to use most frequently, or better yet both the main types.

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December 30th, 2014, 08:24 AM   #5
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Well, I ended up explaining about the non-Tukey one while the Tukey one is only explained briefly within the Outliers sub-chapter.
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