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<html><head><title>R: Class “associations” - A Set of Associations</title>
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<table width="100%" summary="page for associations-class {arules}"><tr><td>associations-class {arules}</td><td align="right">R Documentation</td></tr></table>
<h2>Class “associations” - A Set of Associations</h2>
<h3>Description</h3>
<p>
The <code>associations</code> class is a virtual class which is extended to
represent mining result (e.g., sets of itemsets or rules). The class
provides accessors for the quality slot and a method for sorting the
associations.
</p>
<h3>Objects from the Class</h3>
<p>
A virtual class: No objects may be created from it.
</p>
<h3>Slots</h3>
<dl>
<dt><code>quality</code>:</dt><dd>a data.frame for quality
measures (e.g., interest measures as support or confidence). Each
quality measure is a named vector with the same length as the
number of elements in the set of associations and each vector
element belongs to the association with the same index.</dd>
<dt><code>info</code>:</dt><dd>a list which is used to store algorithm specific
mining information. Typically it contains a least the elements
<code>"data"</code> (name of the transaction data set),
<code>"ntransactions"</code> (length of the data set),
<code>"support"</code> (the minimum support used for mining).</dd>
</dl>
<h3>Methods</h3>
<dl>
<dt>info<-</dt><dd><code>signature(x = "associations")</code>;
replaces the info list.</dd>
<dt>info</dt><dd><code>signature(x = "associations")</code>;
returns the info list.</dd>
<dt>items</dt><dd><code>signature(x = "associations")</code>;
dummy method. This method has to be implemented by all subclasses
of <code>associations</code> and return the items which make up each
association as an object of class
<code>itemMatrix</code>.</dd>
<dt>labels</dt><dd><code>signature(object = "associations")</code>;
dummy method. This method has to be implemented by all subclasses
of <code>associations</code> and return a vector
of <code>length(object)</code> of labels
for the elements in the association.</dd>
<dt>length</dt><dd><code>signature(x = "associations")</code>;
dummy method. This method has to be implemented by all subclasses
of <code>associations</code> and return the number of elements in the
association.</dd>
<dt>quality<-</dt><dd><code>signature(x = "associations")</code>;
replaces the quality data.frame. The lengths of the vectors
in the data.frame have to equal the number of associations
in the set.</dd>
<dt>quality</dt><dd><code>signature(x = "associations")</code>;
returns the quality data.frame.</dd>
<dt>show</dt><dd><code>signature(object = "associations")</code></dd>
</dl>
<h3>Subclasses</h3>
<p>
<code><a href="itemsets-class.html">itemsets-class</a></code>,
<code><a href="rules-class.html">rules-class</a></code>
</p>
<h3>See Also</h3>
<p>
<code><a href="SORT.html">SORT</a></code>,
<code><a href="WRITE.html">WRITE</a></code>,
<code><a href="length.html">length</a></code>,
<code><a href="is.superset.html">is.subset</a></code>,
<code><a href="is.superset.html">is.superset</a></code>,
<code><a href="sets.html">sets</a></code>,
<code><a href="unique.html">unique</a></code>,
<code><a href="itemMatrix-class.html">itemMatrix-class</a></code>
</p>
<hr><div align="center">[Package <em>arules</em> version 0.6-6 <a href="00Index.html">Index]</a></div>
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