Blurb::
Specifies two-sided order statistics (an interval) to be used when
determining sample sizes for random sampling using Wilks order statistics.

Description::
This option causes the sample size to be based on the interval defined by 
the lowest N and uppermost N outputs for order N statistics (default N=1).

<b> Default Behavior </b>
The default for Wilks is one_sided_upper.

Topics::

Examples::
\verbatim
method
  sampling
    sample_type random
    wilks
      two_sided
\endverbatim

Theory::
Faq::
See_Also:: method-sampling-wilks
