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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN""http://www.w3.org/TR/REC-html40/frameset.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc on Wed Sep 04 10:31:49 CDT 2002 --><TITLE>: Class GainRatioSplitCrit</TITLE><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../stylesheet.css" TITLE="Style"></HEAD><BODY BGCOLOR="white"><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_top"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <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 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TARGET="_top"><B>FRAMES</B></A> <A HREF="GainRatioSplitCrit.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | <A HREF="#fields_inherited_from_class_weka.classifiers.j48.EntropyBasedSplitCrit">FIELD</A> | <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><!-- =========== END OF NAVBAR =========== --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">weka.classifiers.j48</FONT><BR>Class GainRatioSplitCrit</H2><PRE>java.lang.Object | +--<A HREF="../../../weka/classifiers/j48/SplitCriterion.html">weka.classifiers.j48.SplitCriterion</A> | +--<A HREF="../../../weka/classifiers/j48/EntropyBasedSplitCrit.html">weka.classifiers.j48.EntropyBasedSplitCrit</A> | +--<B>weka.classifiers.j48.GainRatioSplitCrit</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD>java.io.Serializable</DD></DL><HR><DL><DT>public final class <B>GainRatioSplitCrit</B><DT>extends <A HREF="../../../weka/classifiers/j48/EntropyBasedSplitCrit.html">EntropyBasedSplitCrit</A></DL><P>Class for computing the gain ratio for a given distribution.<P><DL><DT><B>See Also: </B><DD><A HREF="../../../serialized-form.html#weka.classifiers.j48.GainRatioSplitCrit">Serialized Form</A></DL><HR><P><!-- ======== INNER CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><A NAME="fields_inherited_from_class_weka.classifiers.j48.EntropyBasedSplitCrit"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from class weka.classifiers.j48.<A HREF="../../../weka/classifiers/j48/EntropyBasedSplitCrit.html">EntropyBasedSplitCrit</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../../weka/classifiers/j48/EntropyBasedSplitCrit.html#log2">log2</A></CODE></TD></TR></TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><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/classifiers/j48/GainRatioSplitCrit.html#GainRatioSplitCrit()">GainRatioSplitCrit</A></B>()</CODE><BR> </TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><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> double</CODE></FONT></TD><TD><CODE><B><A HREF="../../../weka/classifiers/j48/GainRatioSplitCrit.html#splitCritValue(weka.classifiers.j48.Distribution)">splitCritValue</A></B>(<A HREF="../../../weka/classifiers/j48/Distribution.html">Distribution</A> bags)</CODE><BR> This method is a straightforward implementation of the gain ratio criterion for the given distribution.</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/classifiers/j48/GainRatioSplitCrit.html#splitCritValue(weka.classifiers.j48.Distribution, double, double)">splitCritValue</A></B>(<A HREF="../../../weka/classifiers/j48/Distribution.html">Distribution</A> bags, double totalnoInst, double numerator)</CODE><BR> This method computes the gain ratio in the same way C4.5 does.</TD></TR></TABLE> <A NAME="methods_inherited_from_class_weka.classifiers.j48.EntropyBasedSplitCrit"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from class weka.classifiers.j48.<A HREF="../../../weka/classifiers/j48/EntropyBasedSplitCrit.html">EntropyBasedSplitCrit</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../../weka/classifiers/j48/EntropyBasedSplitCrit.html#logFunc(double)">logFunc</A>, <A HREF="../../../weka/classifiers/j48/EntropyBasedSplitCrit.html#newEnt(weka.classifiers.j48.Distribution)">newEnt</A>, <A HREF="../../../weka/classifiers/j48/EntropyBasedSplitCrit.html#oldEnt(weka.classifiers.j48.Distribution)">oldEnt</A>, <A HREF="../../../weka/classifiers/j48/EntropyBasedSplitCrit.html#splitEnt(weka.classifiers.j48.Distribution)">splitEnt</A></CODE></TD></TR></TABLE> <A NAME="methods_inherited_from_class_weka.classifiers.j48.SplitCriterion"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from class weka.classifiers.j48.<A HREF="../../../weka/classifiers/j48/SplitCriterion.html">SplitCriterion</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../../weka/classifiers/j48/SplitCriterion.html#splitCritValue(weka.classifiers.j48.Distribution, weka.classifiers.j48.Distribution)">splitCritValue</A>, <A HREF="../../../weka/classifiers/j48/SplitCriterion.html#splitCritValue(weka.classifiers.j48.Distribution, weka.classifiers.j48.Distribution, weka.classifiers.j48.Distribution)">splitCritValue</A>, <A HREF="../../../weka/classifiers/j48/SplitCriterion.html#splitCritValue(weka.classifiers.j48.Distribution, weka.classifiers.j48.Distribution, int)">splitCritValue</A></CODE></TD></TR></TABLE> <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from class java.lang.Object</B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD></TR></TABLE> <P><!-- ============ FIELD DETAIL =========== --><!-- ========= CONSTRUCTOR DETAIL ======== --><A NAME="constructor_detail"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=1><FONT SIZE="+2"><B>Constructor Detail</B></FONT></TD></TR></TABLE><A NAME="GainRatioSplitCrit()"><!-- --></A><H3>GainRatioSplitCrit</H3><PRE>public <B>GainRatioSplitCrit</B>()</PRE><DL></DL><!-- ============ METHOD DETAIL ========== --><A NAME="method_detail"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=1><FONT SIZE="+2"><B>Method Detail</B></FONT></TD></TR></TABLE><A NAME="splitCritValue(weka.classifiers.j48.Distribution)"><!-- --></A><H3>splitCritValue</H3><PRE>public final double <B>splitCritValue</B>(<A HREF="../../../weka/classifiers/j48/Distribution.html">Distribution</A> bags)</PRE><DL><DD>This method is a straightforward implementation of the gain ratio criterion for the given distribution.<DD><DL><DT><B>Overrides:</B><DD><CODE><A HREF="../../../weka/classifiers/j48/SplitCriterion.html#splitCritValue(weka.classifiers.j48.Distribution)">splitCritValue</A></CODE> in class <CODE><A HREF="../../../weka/classifiers/j48/SplitCriterion.html">SplitCriterion</A></CODE></DL></DD><DD>Following copied from class: <CODE>weka.classifiers.j48.SplitCriterion</CODE></DD><DD><DL><DT><B>Returns:</B><DD>value of splitting criterion. 0 by default</DL></DD></DL><HR><A NAME="splitCritValue(weka.classifiers.j48.Distribution, double, double)"><!-- --></A><H3>splitCritValue</H3><PRE>public final double <B>splitCritValue</B>(<A HREF="../../../weka/classifiers/j48/Distribution.html">Distribution</A> bags, double totalnoInst, double numerator)</PRE><DL><DD>This method computes the gain ratio in the same way C4.5 does.<DD><DL><DT><B>Parameters:</B><DD><CODE>bags</CODE> - the distribution<DD><CODE>totalnoInst</CODE> - the weight of ALL instances<DD><CODE>numerator</CODE> - the info gain</DL></DD></DL><!-- ========= END OF CLASS DATA ========= --><HR><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_bottom"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_bottom_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <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 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