Box and Whisker Diagram

# Box and Whisker Diagram - Outliers An outlier is the values...

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Box and Whisker Diagram A box and whisker diagram or box-plot is a graphical mean for displaying the five  number summary of a set of data. In a box-plot the first quartile is placed at the lower hinge and  the third quartile is placed at the upper hinge. The median is placed in between these two  hinges. The two lines emanating from the box are called whiskers. The box and whisker  diagram was introduced by Professor Jhon W. Tukey. Construction of Box-Plot 1. Start the box from Q1 and end at Q3 2. Within the box draw a line to represent Q2 3. Draw lower whisker to Min. Value up to Q1 4. Draw upper Whisker from Q3 up to Max. Value
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Unformatted text preview: Outliers An outlier is the values that falls well outside the overall pattern of the data. It might be • the result of a measurement or recording error, • a member from a different population, • simply an unusual extreme value. An extreme value needs not to be an outliers; it might, instead, be an indication of skewness. Identification of the Outliers 1. The values that lie within inner fences are normal values 2. The values that lie outside inner fences but inside outer fences are possible/suspected/ mild outliers 3. The values that lie outside outer fences are sure outliers...
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## This note was uploaded on 06/19/2011 for the course ECON 202 taught by Professor Pharuddin during the Summer '11 term at The School of the Art Institute of Chicago.

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