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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.stats-dens-pmf-negative-binomial" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<refnamediv>
<refname>stats_dens_pmf_negative_binomial</refname>
<refpurpose>Probability mass function of the negative binomial distribution</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>float</type><methodname>stats_dens_pmf_negative_binomial</methodname>
<methodparam><type>float</type><parameter>x</parameter></methodparam>
<methodparam><type>float</type><parameter>n</parameter></methodparam>
<methodparam><type>float</type><parameter>pi</parameter></methodparam>
</methodsynopsis>
<para>
Returns the probability mass at <parameter>x</parameter>, where the
random variable follows the negative binomial distribution of which
the number of the success is <parameter>n</parameter> and the success
rate is <parameter>pi</parameter>.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>x</parameter></term>
<listitem>
<para>
The value at which the probability mass is calculated
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>n</parameter></term>
<listitem>
<para>
The number of the success of the distribution
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>pi</parameter></term>
<listitem>
<para>
The success rate of the distribution
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
The probability mass at <parameter>x</parameter> or &false; for failure.
</para>
</refsect1>
<!--
<refsect1 role="errors">
&reftitle.errors;
<para>
When does this function issue E_* level errors, and/or throw exceptions.
</para>
</refsect1>
-->
<!--
<refsect1 role="changelog">
&reftitle.changelog;
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>Enter the version of change here</entry>
<entry>
Describe the change
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
-->
<!--
<refsect1 role="examples">
&reftitle.examples;
<example xml:id="function-name.example.basic">
<title><function>function-name</function> example</title>
<para>
Any text that describes the purpose of the example, or what
goes on in the example should be here. (Inside the <example> tag, not out).
</para>
<programlisting role="php">
<![CDATA[
<?php
if ($anexample === true) {
echo 'Use the PEAR Coding standards';
}
if ($thereisoutput === 'and it is multiple lines') {
echo 'Use a screen like we did below';
}
?>
]]>
</programlisting>
&example.outputs.similar;
<screen>
<![CDATA[
Use the PEAR Coding standards
Use a screen like we did below
]]>
</screen>
</example>
</refsect1>
-->
<!--
<refsect1 role="seealso">
&reftitle.seealso;
<simplelist>
<member><function>somefunc</function></member>
<member><function>another_func</function></member>
<member>The <link linkend="something">something appendix</link></member>
</simplelist>
</refsect1>
-->
</refentry>
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