Box plot: Difference between revisions

Revision as of 04:19, 11 September 2004

Revision as of 04:24, 11 September 2004

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* [[interquartile range]], IQR = <math>Q3-Q1</math> = 2

* the value 3.5 is a "mild" outlier, between 1.5*(IQR) and 2*(IQR) below Q1

* the value 0.5 is an "extreme" outlier, more than 2*(IQR) abovebelow Q3Q1

* the smallest value that is ''not'' an outlier is 5

* the data is [[skewness|skewed]] to the left (''negatively skewed'')

The horizontal lines (the "whiskers") extend to at most 1.5 times the box width

(the [[interquartile range]]) from theeither or both ends of the box. They must end

at an observed value, thus connecting all the values outside the box

that are not more than 1.5 times the box width away from the box. Twice the box