Box Plot

Budget Constraint 35

Sometimes a 'box and whisker' plot. This is a figure in which the ends of the 'box' indicate the upper and lower values of the interquartile range of a variable, the vertical line through the box indicates the median value; the 'whiskers', which are the lines extending from either side of the box, indicate the 95 per cent central range of the variable; points beyond the extremities of the whisker identify the maximum and minimum values (in some box plots, the ends of the whiskers are the two extreme values). In descriptive statistics the two extreme values, the two limits of the interquartile range and the median are sometimes referred to as the '5 number summary' of the data. In some versions, the box plot is presented vertically.


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