Sunday, April 24, 2011

Box plot

Box plot
A box plot graphs numerical data through 5-number summaries; the smallest observation, lower quartile (Q1), median (Q2), upper quartile (Q3), and largest observation. The three quartiles are marked with a box, and the smallest and largest observations and marked with the end points of the line. The spacings between each box can differ depending on the degree of dispersion and skewness of the data. 

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