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Box-whisker graph
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Box-whisker graphs show spreads of values in one or more data
sets.
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The box-whisker graph illustrates the spread of data groups around their
medians, using a "box" and "whiskers" to break down each data group by
percentile.
In creating a box-whisker graph, you can either specify values for each of the
seven percentiles (provide "parametric" data) or supply "raw" data for Graphics
Server to group into percentiles and graph.
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With parametric data, you need exactly seven
data sets, which specify the values at percentiles of 5, 10, 25,
50 (the median), 75, 90, and 95. The number of data points in
each set determines how many box-whisker figures are drawn.
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With raw data, you need enough data sets
to hold all the values making up each group (always at least seven
sets). In drawing the graph, Graphics Server sorts the values
for each group, then calculates weights for the seven percentiles
(5, 10, 25, 50, 75, 90, or 95).
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For raw data, you can optionally add symbols
to the graph showing each value. If a group contains duplicate
values, only one symbol is shown at that position.
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One box-whisker figure is drawn for each
data point.
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If you don’t supply an X position for
each data point, Graphics Server automatically places points at
increments of 1, starting at 1.
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You can optionally omit the median notch
and the whiskers (percentiles 5 and 95).
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You can optionally outline the box-whisker
figures with a solid black border. In this case, a line will also
be drawn across the median. You can omit the median line if you
prefer.
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Box-whisker figures are normally filled with
a solid pattern. You can choose another pattern.
Use a box-whisker graph...
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When you want to show how the values in one or more data groups are distributed
around their medians. You can either specify the percentile breakdowns of the
data groups or provide raw data and have Graphics Server determine the
percentile breakdowns.
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