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Box Plots and Mosaic Plots |

*n* be the number of data values

*y _{1}*,

*p* be the desired percentile (25, 50, or 75)

*i* be the integer part, and *f* the fractional part,
of the ordinal of the desired percentile:

*i* + *f* = *n* * *p* / 100

Then the value of the desired percentile is

You can adjust three calculation methods by clicking
on the **Method** button in the variables dialog.
This displays the method options dialog.

**Figure 33.5:** Box Plot/Mosaic Plot Method Options Dialog

By default, *whiskers* on the box plot are drawn from
the quartiles to the farthest observation not farther
than 1.5 times the distance between the quartiles.
Type your preferred whisker length factor in the entry field.
The figures in this chapter were created using whisker lengths that
were 1.0 times the distance between the quartiles; this results
in more observations being classified as outliers.
By default, for variables in mosaic plots,
values that represent less than 4% of the total
frequency are grouped together in an "**Other**" category.
The Method dialog enables you to change the threshold
at which values are grouped in the **Other** category.

By default, **X** variable values are sorted by their formatted value.
Turn off the **Sort X Formatted** check box
to sort **X** variable values by their unformatted value.

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