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								<title>Conceptual Requirements for Distribution Types</title>
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								<link rel="prev" href="real_concepts.html" title="Conceptual Requirements for Real Number Types">
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								<a accesskey="p" href="real_concepts.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../using_udt.html"><img src="../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="archetypes.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a>
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								<div class="section">
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								<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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								<a name="math_toolkit.dist_concept"></a><a class="link" href="dist_concept.html" title="Conceptual Requirements for Distribution Types">Conceptual Requirements for
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								    Distribution Types</a>
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								</h2></div></div></div>
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								<p>
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								      A <span class="emphasis"><em>DistributionType</em></span> is a type that implements the following
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								      conceptual requirements, and encapsulates a statistical distribution.
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								    </p>
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								<p>
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								      Please note that this documentation should not be used as a substitute for
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								      the <a class="link" href="dist_ref.html" title="Statistical Distributions Reference">reference documentation</a>, and
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								      <a class="link" href="stat_tut.html" title="Statistical Distributions Tutorial">tutorial</a> of the statistical distributions.
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								    </p>
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								<p>
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								      In the following table, <span class="emphasis"><em>d</em></span> is an object of type <code class="computeroutput"><span class="identifier">DistributionType</span></code>, <span class="emphasis"><em>cd</em></span>
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								      is an object of type <code class="computeroutput"><span class="keyword">const</span> <span class="identifier">DistributionType</span></code>
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								      and <span class="emphasis"><em>cr</em></span> is an object of a type convertible to <code class="computeroutput"><span class="identifier">RealType</span></code>.
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								    </p>
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								<div class="informaltable"><table class="table">
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								<colgroup>
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								<col>
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								<col>
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								<col>
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								</colgroup>
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								<thead><tr>
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								<th>
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								              <p>
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								                Expression
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								              </p>
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								            </th>
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								<th>
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								              <p>
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								                Result Type
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								              </p>
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								            </th>
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								<th>
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								              <p>
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								                Notes
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								              </p>
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								            </th>
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								</tr></thead>
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								<tbody>
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								<tr>
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								<td>
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								              <p>
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								                DistributionType::value_type
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								              </p>
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								            </td>
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								<td>
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								              <p>
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								                RealType
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								              </p>
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								            </td>
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								<td>
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								              <p>
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								                The real-number type <span class="emphasis"><em>RealType</em></span> upon which the
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								                distribution operates.
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								              </p>
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								            </td>
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								</tr>
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								<tr>
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								<td>
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								              <p>
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								                DistributionType::policy_type
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								              </p>
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								            </td>
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								<td>
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								              <p>
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								                RealType
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								              </p>
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								            </td>
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								<td>
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								              <p>
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								                The <a class="link" href="../policy.html" title="Chapter 15. Policies: Controlling Precision, Error Handling etc">Policy</a> to use when evaluating functions
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								                that depend on this distribution.
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								              </p>
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								            </td>
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								</tr>
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								<tr>
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								<td>
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								              <p>
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								                d = cd
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								              </p>
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								            </td>
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								<td>
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								              <p>
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								                Distribution&
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								              </p>
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								            </td>
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								<td>
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								              <p>
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								                Distribution types are assignable.
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								              </p>
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								            </td>
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								</tr>
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								<tr>
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								<td>
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								              <p>
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								                Distribution(cd)
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								              </p>
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								            </td>
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								<td>
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								              <p>
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								                Distribution
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								              </p>
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								            </td>
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								<td>
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								              <p>
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								                Distribution types are copy constructible.
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								              </p>
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								            </td>
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								</tr>
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								<tr>
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								<td>
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								              <p>
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								                pdf(cd, cr)
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								              </p>
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								            </td>
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								<td>
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								              <p>
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								                RealType
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								              </p>
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								            </td>
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								<td>
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								              <p>
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								                Returns the PDF of the distribution.
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								              </p>
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								            </td>
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								</tr>
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								<tr>
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								<td>
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								              <p>
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								                cdf(cd, cr)
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								              </p>
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								            </td>
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								<td>
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								              <p>
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								                RealType
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								              </p>
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								            </td>
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								<td>
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								              <p>
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								                Returns the CDF of the distribution.
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								              </p>
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								            </td>
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								</tr>
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								<tr>
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								<td>
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								              <p>
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								                cdf(complement(cd, cr))
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								              </p>
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								            </td>
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								<td>
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								              <p>
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								                RealType
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								              </p>
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								            </td>
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								<td>
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								              <p>
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								                Returns the complement of the CDF of the distribution, the same as:
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						||
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								                <code class="computeroutput"><span class="number">1</span><span class="special">-</span><span class="identifier">cdf</span><span class="special">(</span><span class="identifier">cd</span><span class="special">,</span> <span class="identifier">cr</span><span class="special">)</span></code>
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								              </p>
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								            </td>
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								</tr>
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								<tr>
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								<td>
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								              <p>
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								                quantile(cd, cr)
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								              </p>
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								            </td>
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								<td>
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								              <p>
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								                RealType
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								              </p>
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								            </td>
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								<td>
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								              <p>
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								                Returns the quantile (or percentile) of the distribution.
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								              </p>
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								            </td>
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								</tr>
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								<tr>
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								<td>
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								              <p>
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								                quantile(complement(cd, cr))
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								              </p>
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								            </td>
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								<td>
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								              <p>
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								                RealType
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								              </p>
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								            </td>
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								<td>
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								              <p>
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								                Returns the quantile (or percentile) of the distribution, starting
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								                from the complement of the probability, the same as: <code class="computeroutput"><span class="identifier">quantile</span><span class="special">(</span><span class="identifier">cd</span><span class="special">,</span> <span class="number">1</span><span class="special">-</span><span class="identifier">cr</span><span class="special">)</span></code>
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								              </p>
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								            </td>
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								</tr>
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								<tr>
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								<td>
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								              <p>
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								                chf(cd, cr)
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								              </p>
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								            </td>
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								<td>
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								              <p>
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								                RealType
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								              </p>
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								            </td>
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								<td>
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								              <p>
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								                Returns the cumulative hazard function of the distribution.
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								              </p>
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								            </td>
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								</tr>
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| 
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								<tr>
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						||
| 
								 | 
							
								<td>
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								              <p>
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								                hazard(cd, cr)
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						||
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								              </p>
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						||
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								            </td>
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						||
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								<td>
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						||
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								 | 
							
								              <p>
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						||
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								                RealType
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						||
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								              </p>
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						||
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								            </td>
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						||
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								<td>
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						||
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								              <p>
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						||
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								                Returns the hazard function of the distribution.
							 | 
						||
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								              </p>
							 | 
						||
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								 | 
							
								            </td>
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						||
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								 | 
							
								</tr>
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								 | 
							
								<tr>
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						||
| 
								 | 
							
								<td>
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						||
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								              <p>
							 | 
						||
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								 | 
							
								                kurtosis(cd)
							 | 
						||
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								 | 
							
								              </p>
							 | 
						||
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								 | 
							
								            </td>
							 | 
						||
| 
								 | 
							
								<td>
							 | 
						||
| 
								 | 
							
								              <p>
							 | 
						||
| 
								 | 
							
								                RealType
							 | 
						||
| 
								 | 
							
								              </p>
							 | 
						||
| 
								 | 
							
								            </td>
							 | 
						||
| 
								 | 
							
								<td>
							 | 
						||
| 
								 | 
							
								              <p>
							 | 
						||
| 
								 | 
							
								                Returns the kurtosis of the distribution.
							 | 
						||
| 
								 | 
							
								              </p>
							 | 
						||
| 
								 | 
							
								            </td>
							 | 
						||
| 
								 | 
							
								</tr>
							 | 
						||
| 
								 | 
							
								<tr>
							 | 
						||
| 
								 | 
							
								<td>
							 | 
						||
| 
								 | 
							
								              <p>
							 | 
						||
| 
								 | 
							
								                kurtosis_excess(cd)
							 | 
						||
| 
								 | 
							
								              </p>
							 | 
						||
| 
								 | 
							
								            </td>
							 | 
						||
| 
								 | 
							
								<td>
							 | 
						||
| 
								 | 
							
								              <p>
							 | 
						||
| 
								 | 
							
								                RealType
							 | 
						||
| 
								 | 
							
								              </p>
							 | 
						||
| 
								 | 
							
								            </td>
							 | 
						||
| 
								 | 
							
								<td>
							 | 
						||
| 
								 | 
							
								              <p>
							 | 
						||
| 
								 | 
							
								                Returns the kurtosis excess of the distribution.
							 | 
						||
| 
								 | 
							
								              </p>
							 | 
						||
| 
								 | 
							
								            </td>
							 | 
						||
| 
								 | 
							
								</tr>
							 | 
						||
| 
								 | 
							
								<tr>
							 | 
						||
| 
								 | 
							
								<td>
							 | 
						||
| 
								 | 
							
								              <p>
							 | 
						||
| 
								 | 
							
								                mean(cd)
							 | 
						||
| 
								 | 
							
								              </p>
							 | 
						||
| 
								 | 
							
								            </td>
							 | 
						||
| 
								 | 
							
								<td>
							 | 
						||
| 
								 | 
							
								              <p>
							 | 
						||
| 
								 | 
							
								                RealType
							 | 
						||
| 
								 | 
							
								              </p>
							 | 
						||
| 
								 | 
							
								            </td>
							 | 
						||
| 
								 | 
							
								<td>
							 | 
						||
| 
								 | 
							
								              <p>
							 | 
						||
| 
								 | 
							
								                Returns the mean of the distribution.
							 | 
						||
| 
								 | 
							
								              </p>
							 | 
						||
| 
								 | 
							
								            </td>
							 | 
						||
| 
								 | 
							
								</tr>
							 | 
						||
| 
								 | 
							
								<tr>
							 | 
						||
| 
								 | 
							
								<td>
							 | 
						||
| 
								 | 
							
								              <p>
							 | 
						||
| 
								 | 
							
								                mode(cd)
							 | 
						||
| 
								 | 
							
								              </p>
							 | 
						||
| 
								 | 
							
								            </td>
							 | 
						||
| 
								 | 
							
								<td>
							 | 
						||
| 
								 | 
							
								              <p>
							 | 
						||
| 
								 | 
							
								                RealType
							 | 
						||
| 
								 | 
							
								              </p>
							 | 
						||
| 
								 | 
							
								            </td>
							 | 
						||
| 
								 | 
							
								<td>
							 | 
						||
| 
								 | 
							
								              <p>
							 | 
						||
| 
								 | 
							
								                Returns the mode of the distribution.
							 | 
						||
| 
								 | 
							
								              </p>
							 | 
						||
| 
								 | 
							
								            </td>
							 | 
						||
| 
								 | 
							
								</tr>
							 | 
						||
| 
								 | 
							
								<tr>
							 | 
						||
| 
								 | 
							
								<td>
							 | 
						||
| 
								 | 
							
								              <p>
							 | 
						||
| 
								 | 
							
								                skewness(cd)
							 | 
						||
| 
								 | 
							
								              </p>
							 | 
						||
| 
								 | 
							
								            </td>
							 | 
						||
| 
								 | 
							
								<td>
							 | 
						||
| 
								 | 
							
								              <p>
							 | 
						||
| 
								 | 
							
								                RealType
							 | 
						||
| 
								 | 
							
								              </p>
							 | 
						||
| 
								 | 
							
								            </td>
							 | 
						||
| 
								 | 
							
								<td>
							 | 
						||
| 
								 | 
							
								              <p>
							 | 
						||
| 
								 | 
							
								                Returns the skewness of the distribution.
							 | 
						||
| 
								 | 
							
								              </p>
							 | 
						||
| 
								 | 
							
								            </td>
							 | 
						||
| 
								 | 
							
								</tr>
							 | 
						||
| 
								 | 
							
								<tr>
							 | 
						||
| 
								 | 
							
								<td>
							 | 
						||
| 
								 | 
							
								              <p>
							 | 
						||
| 
								 | 
							
								                standard_deviation(cd)
							 | 
						||
| 
								 | 
							
								              </p>
							 | 
						||
| 
								 | 
							
								            </td>
							 | 
						||
| 
								 | 
							
								<td>
							 | 
						||
| 
								 | 
							
								              <p>
							 | 
						||
| 
								 | 
							
								                RealType
							 | 
						||
| 
								 | 
							
								              </p>
							 | 
						||
| 
								 | 
							
								            </td>
							 | 
						||
| 
								 | 
							
								<td>
							 | 
						||
| 
								 | 
							
								              <p>
							 | 
						||
| 
								 | 
							
								                Returns the standard deviation of the distribution.
							 | 
						||
| 
								 | 
							
								              </p>
							 | 
						||
| 
								 | 
							
								            </td>
							 | 
						||
| 
								 | 
							
								</tr>
							 | 
						||
| 
								 | 
							
								<tr>
							 | 
						||
| 
								 | 
							
								<td>
							 | 
						||
| 
								 | 
							
								              <p>
							 | 
						||
| 
								 | 
							
								                variance(cd)
							 | 
						||
| 
								 | 
							
								              </p>
							 | 
						||
| 
								 | 
							
								            </td>
							 | 
						||
| 
								 | 
							
								<td>
							 | 
						||
| 
								 | 
							
								              <p>
							 | 
						||
| 
								 | 
							
								                RealType
							 | 
						||
| 
								 | 
							
								              </p>
							 | 
						||
| 
								 | 
							
								            </td>
							 | 
						||
| 
								 | 
							
								<td>
							 | 
						||
| 
								 | 
							
								              <p>
							 | 
						||
| 
								 | 
							
								                Returns the variance of the distribution.
							 | 
						||
| 
								 | 
							
								              </p>
							 | 
						||
| 
								 | 
							
								            </td>
							 | 
						||
| 
								 | 
							
								</tr>
							 | 
						||
| 
								 | 
							
								</tbody>
							 | 
						||
| 
								 | 
							
								</table></div>
							 | 
						||
| 
								 | 
							
								</div>
							 | 
						||
| 
								 | 
							
								<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
							 | 
						||
| 
								 | 
							
								<td align="left"></td>
							 | 
						||
| 
								 | 
							
								<td align="right"><div class="copyright-footer">Copyright © 2006-2010, 2012-2014 Nikhar Agrawal,
							 | 
						||
| 
								 | 
							
								      Anton Bikineev, Paul A. Bristow, Marco Guazzone, Christopher Kormanyos, Hubert
							 | 
						||
| 
								 | 
							
								      Holin, Bruno Lalande, John Maddock, Jeremy Murphy, Johan Råde, Gautam Sewani,
							 | 
						||
| 
								 | 
							
								      Benjamin Sobotta, Thijs van den Berg, Daryle Walker and Xiaogang Zhang<p>
							 | 
						||
| 
								 | 
							
								        Distributed under the Boost Software License, Version 1.0. (See accompanying
							 | 
						||
| 
								 | 
							
								        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
							 | 
						||
| 
								 | 
							
								      </p>
							 | 
						||
| 
								 | 
							
								</div></td>
							 | 
						||
| 
								 | 
							
								</tr></table>
							 | 
						||
| 
								 | 
							
								<hr>
							 | 
						||
| 
								 | 
							
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