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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc (build 1.4.2_05) on Mon Mar 07 15:27:03 NZDT 2005 --><TITLE>AprioriItemSet</TITLE><META NAME="keywords" CONTENT="weka.associations.AprioriItemSet class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="AprioriItemSet";}</SCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=3 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../Tutorial.pdf"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="http://www.cs.waikato.ac.nz/ml/weka/index.html"><FONT CLASS="NavBarFont1"><B>Weka's home</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../weka/associations/Apriori.html" title="class in weka.associations"><B>PREV CLASS</B></A> <A HREF="../../weka/associations/Associator.html" title="class in weka.associations"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../index.html" target="_top"><B>FRAMES</B></A> <A HREF="AprioriItemSet.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | FIELD | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">weka.associations</FONT><BR>Class AprioriItemSet</H2><PRE>java.lang.Object <IMG SRC="../../resources/inherit.gif" ALT="extended by"><A HREF="../../weka/associations/ItemSet.html" title="class in weka.associations">weka.associations.ItemSet</A> <IMG SRC="../../resources/inherit.gif" ALT="extended by"><B>weka.associations.AprioriItemSet</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD>java.io.Serializable</DD></DL><HR><DL><DT>public class <B>AprioriItemSet</B><DT>extends <A HREF="../../weka/associations/ItemSet.html" title="class in weka.associations">ItemSet</A><DT>implements java.io.Serializable</DL><P>Class for storing a set of items. Item sets are stored in a lexicographic order, which is determined by the header information of the set of instances used for generating the set of items. All methods in this class assume that item sets are stored in lexicographic order. The class provides methods that are used in the Apriori algorithm to construct association rules.<P><P><DL><DT><B>Version:</B></DT> <DD>$Revision: 1.2.2.1 $</DD><DT><B>Author:</B></DT> <DD>Eibe Frank (eibe@cs.waikato.ac.nz), Stefan Mutter (mutter@cs.waikato.ac.nz)</DD><DT><B>See Also:</B><DD><A HREF="../../serialized-form.html#weka.associations.AprioriItemSet">Serialized Form</A></DL><HR><P><!-- ======== NESTED CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../weka/associations/AprioriItemSet.html#AprioriItemSet(int)">AprioriItemSet</A></B>(int totalTrans)</CODE><BR> Constructor</TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Method Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static double</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/AprioriItemSet.html#confidenceForRule(weka.associations.AprioriItemSet, weka.associations.AprioriItemSet)">confidenceForRule</A></B>(<A HREF="../../weka/associations/AprioriItemSet.html" title="class in weka.associations">AprioriItemSet</A> premise, <A HREF="../../weka/associations/AprioriItemSet.html" title="class in weka.associations">AprioriItemSet</A> consequence)</CODE><BR> Outputs the confidence for a rule.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> double</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/AprioriItemSet.html#convictionForRule(weka.associations.AprioriItemSet, weka.associations.AprioriItemSet, int, int)">convictionForRule</A></B>(<A HREF="../../weka/associations/AprioriItemSet.html" title="class in weka.associations">AprioriItemSet</A> premise, <A HREF="../../weka/associations/AprioriItemSet.html" title="class in weka.associations">AprioriItemSet</A> consequence, int premiseCount, int consequenceCount)</CODE><BR> Outputs the conviction for a rule.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A>[]</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/AprioriItemSet.html#generateRules(double, weka.core.FastVector, int)">generateRules</A></B>(double minConfidence, <A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A> hashtables, int numItemsInSet)</CODE><BR> Generates all rules for an item set.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A>[]</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/AprioriItemSet.html#generateRulesBruteForce(double, int, weka.core.FastVector, int, int, double)">generateRulesBruteForce</A></B>(double minMetric, int metricType, <A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A> hashtables, int numItemsInSet, int numTransactions, double significanceLevel)</CODE><BR> Generates all significant rules for an item set.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> double</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/AprioriItemSet.html#leverageForRule(weka.associations.AprioriItemSet, weka.associations.AprioriItemSet, int, int)">leverageForRule</A></B>(<A HREF="../../weka/associations/AprioriItemSet.html" title="class in weka.associations">AprioriItemSet</A> premise, <A HREF="../../weka/associations/AprioriItemSet.html" title="class in weka.associations">AprioriItemSet</A> consequence, int premiseCount, int consequenceCount)</CODE><BR> Outputs the leverage for a rule.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> double</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/AprioriItemSet.html#liftForRule(weka.associations.AprioriItemSet, weka.associations.AprioriItemSet, int)">liftForRule</A></B>(<A HREF="../../weka/associations/AprioriItemSet.html" title="class in weka.associations">AprioriItemSet</A> premise, <A HREF="../../weka/associations/AprioriItemSet.html" title="class in weka.associations">AprioriItemSet</A> consequence, int consequenceCount)</CODE><BR> Outputs the lift for a rule.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/AprioriItemSet.html#mergeAllItemSets(weka.core.FastVector, int, int)">mergeAllItemSets</A></B>(<A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A> itemSets, int size, int totalTrans)</CODE><BR> Merges all item sets in the set of (k-1)-item sets to create the (k)-item sets and updates the counters.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/AprioriItemSet.html#singletons(weka.core.Instances)">singletons</A></B>(<A HREF="../../weka/core/Instances.html" title="class in weka.core">Instances</A> instances)</CODE><BR> Converts the header info of the given set of instances into a set of item sets (singletons).</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../weka/associations/AprioriItemSet.html" title="class in weka.associations">AprioriItemSet</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/AprioriItemSet.html#subtract(weka.associations.AprioriItemSet)">subtract</A></B>(<A HREF="../../weka/associations/AprioriItemSet.html" title="class in weka.associations">AprioriItemSet</A> toSubtract)</CODE><BR> Subtracts an item set from another one.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> java.lang.String</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/AprioriItemSet.html#toString(weka.core.Instances)">toString</A></B>(<A HREF="../../weka/core/Instances.html" title="class in weka.core">Instances</A> instances)</CODE><BR> Returns the contents of an item set as a string.</TD></TR></TABLE> <A NAME="methods_inherited_from_class_weka.associations.ItemSet"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from class weka.associations.<A HREF="../../weka/associations/ItemSet.html" title="class in weka.associations">ItemSet</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../weka/associations/ItemSet.html#containedBy(weka.core.Instance)">containedBy</A>, <A HREF="../../weka/associations/ItemSet.html#counter()">counter</A>, <A HREF="../../weka/associations/ItemSet.html#deleteItemSets(weka.core.FastVector, int, int)">deleteItemSets</A>, <A HREF="../../weka/associations/ItemSet.html#equals(java.lang.Object)">equals</A>, <A HREF="../../weka/associations/ItemSet.html#getHashtable(weka.core.FastVector, int)">getHashtable</A>, <A HREF="../../weka/associations/ItemSet.html#hashCode()">hashCode</A>, <A HREF="../../weka/associations/ItemSet.html#itemAt(int)">itemAt</A>, <A HREF="../../weka/associations/ItemSet.html#items()">items</A>, <A HREF="../../weka/associations/ItemSet.html#pruneItemSets(weka.core.FastVector, java.util.Hashtable)">pruneItemSets</A>, <A HREF="../../weka/associations/ItemSet.html#pruneRules(weka.core.FastVector[], double)">pruneRules</A>, <A HREF="../../weka/associations/ItemSet.html#setCounter(int)">setCounter</A>, <A HREF="../../weka/associations/ItemSet.html#setItem(int[])">setItem</A>, <A HREF="../../weka/associations/ItemSet.html#setItemAt(int, int)">setItemAt</A>, <A HREF="../../weka/associations/ItemSet.html#support()">support</A>, <A HREF="../../weka/associations/ItemSet.html#upDateCounter(weka.core.Instance)">upDateCounter</A>, <A HREF="../../weka/associations/ItemSet.html#upDateCounters(weka.core.FastVector, weka.core.Instances)">upDateCounters</A></CODE></TD></TR></TABLE> <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from class java.lang.Object</B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE>getClass, notify, notifyAll, toString, wait, wait, wait</CODE></TD></TR></TABLE> <P><!-- ============ FIELD DETAIL =========== --><!-- ========= CONSTRUCTOR DETAIL ======== --><A NAME="constructor_detail"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=1><FONT SIZE="+2"><B>Constructor Detail</B></FONT></TD></TR></TABLE><A NAME="AprioriItemSet(int)"><!-- --></A><H3>AprioriItemSet</H3><PRE>public <B>AprioriItemSet</B>(int totalTrans)</PRE><DL>⌨️ 快捷键说明
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