relieffattributeeval.html

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<DT><B>Returns:</B><DD>a description of the evaluator suitable for
 displaying in the explorer/experimenter gui</DL>
</DD>
</DL>
<HR>

<A NAME="listOptions()"><!-- --></A><H3>
listOptions</H3>
<PRE>
public java.util.Enumeration <B>listOptions</B>()</PRE>
<DL>
<DD>Returns an enumeration describing the available options<DD><DL>
<DT><B>Specified by: </B><DD><CODE><A HREF="../../weka/core/OptionHandler.html#listOptions()">listOptions</A></CODE> in interface <CODE><A HREF="../../weka/core/OptionHandler.html">OptionHandler</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>an enumeration of all the available options</DL>
</DD>
</DL>
<HR>

<A NAME="setOptions(java.lang.String[])"><!-- --></A><H3>
setOptions</H3>
<PRE>
public void <B>setOptions</B>(java.lang.String[]&nbsp;options)
                throws java.lang.Exception</PRE>
<DL>
<DD>Parses a given list of options.

 Valid options are: <p>

 -M <number of instances> <br>
 Specify the number of instances to sample when estimating attributes. <br>
 If not specified then all instances will be used. <p>

 -D <seed> <br>
 Seed for randomly sampling instances. <p>

 -K <number of neighbours> <br>
 Number of nearest neighbours to use for estimating attributes. <br>
 (Default is 10). <p>

 -W <br>
 Weight nearest neighbours by distance. <p>

 -A <sigma> <br>
 Specify sigma value (used in an exp function to control how quickly <br>
 weights decrease for more distant instances). Use in conjunction with <br>
 -W. Sensible values = 1/5 to 1/10 the number of nearest neighbours. <br><DD><DL>
<DT><B>Specified by: </B><DD><CODE><A HREF="../../weka/core/OptionHandler.html#setOptions(java.lang.String[])">setOptions</A></CODE> in interface <CODE><A HREF="../../weka/core/OptionHandler.html">OptionHandler</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>options</CODE> - the list of options as an array of strings<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if an option is not supported</DL>
</DD>
</DL>
<HR>

<A NAME="sigmaTipText()"><!-- --></A><H3>
sigmaTipText</H3>
<PRE>
public java.lang.String <B>sigmaTipText</B>()</PRE>
<DL>
<DD>Returns the tip text for this property<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>tip text for this property suitable for
 displaying in the explorer/experimenter gui</DL>
</DD>
</DL>
<HR>

<A NAME="setSigma(int)"><!-- --></A><H3>
setSigma</H3>
<PRE>
public void <B>setSigma</B>(int&nbsp;s)
              throws java.lang.Exception</PRE>
<DL>
<DD>Sets the sigma value.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>s</CODE> - the value of sigma (> 0)<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if s is not positive</DL>
</DD>
</DL>
<HR>

<A NAME="getSigma()"><!-- --></A><H3>
getSigma</H3>
<PRE>
public int <B>getSigma</B>()</PRE>
<DL>
<DD>Get the value of sigma.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the sigma value.</DL>
</DD>
</DL>
<HR>

<A NAME="numNeighboursTipText()"><!-- --></A><H3>
numNeighboursTipText</H3>
<PRE>
public java.lang.String <B>numNeighboursTipText</B>()</PRE>
<DL>
<DD>Returns the tip text for this property<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>tip text for this property suitable for
 displaying in the explorer/experimenter gui</DL>
</DD>
</DL>
<HR>

<A NAME="setNumNeighbours(int)"><!-- --></A><H3>
setNumNeighbours</H3>
<PRE>
public void <B>setNumNeighbours</B>(int&nbsp;n)</PRE>
<DL>
<DD>Set the number of nearest neighbours<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>n</CODE> - the number of nearest neighbours.</DL>
</DD>
</DL>
<HR>

<A NAME="getNumNeighbours()"><!-- --></A><H3>
getNumNeighbours</H3>
<PRE>
public int <B>getNumNeighbours</B>()</PRE>
<DL>
<DD>Get the number of nearest neighbours<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the number of nearest neighbours</DL>
</DD>
</DL>
<HR>

<A NAME="seedTipText()"><!-- --></A><H3>
seedTipText</H3>
<PRE>
public java.lang.String <B>seedTipText</B>()</PRE>
<DL>
<DD>Returns the tip text for this property<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>tip text for this property suitable for
 displaying in the explorer/experimenter gui</DL>
</DD>
</DL>
<HR>

<A NAME="setSeed(int)"><!-- --></A><H3>
setSeed</H3>
<PRE>
public void <B>setSeed</B>(int&nbsp;s)</PRE>
<DL>
<DD>Set the random number seed for randomly sampling instances.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>s</CODE> - the random number seed.</DL>
</DD>
</DL>
<HR>

<A NAME="getSeed()"><!-- --></A><H3>
getSeed</H3>
<PRE>
public int <B>getSeed</B>()</PRE>
<DL>
<DD>Get the seed used for randomly sampling instances.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the random number seed.</DL>
</DD>
</DL>
<HR>

<A NAME="sampleSizeTipText()"><!-- --></A><H3>
sampleSizeTipText</H3>
<PRE>
public java.lang.String <B>sampleSizeTipText</B>()</PRE>
<DL>
<DD>Returns the tip text for this property<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>tip text for this property suitable for
 displaying in the explorer/experimenter gui</DL>
</DD>
</DL>
<HR>

<A NAME="setSampleSize(int)"><!-- --></A><H3>
setSampleSize</H3>
<PRE>
public void <B>setSampleSize</B>(int&nbsp;s)</PRE>
<DL>
<DD>Set the number of instances to sample for attribute estimation<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>s</CODE> - the number of instances to sample.</DL>
</DD>
</DL>
<HR>

<A NAME="getSampleSize()"><!-- --></A><H3>
getSampleSize</H3>
<PRE>
public int <B>getSampleSize</B>()</PRE>
<DL>
<DD>Get the number of instances used for estimating attributes<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the number of instances.</DL>
</DD>
</DL>
<HR>

<A NAME="weightByDistanceTipText()"><!-- --></A><H3>
weightByDistanceTipText</H3>
<PRE>
public java.lang.String <B>weightByDistanceTipText</B>()</PRE>
<DL>
<DD>Returns the tip text for this property<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>tip text for this property suitable for
 displaying in the explorer/experimenter gui</DL>
</DD>
</DL>
<HR>

<A NAME="setWeightByDistance(boolean)"><!-- --></A><H3>
setWeightByDistance</H3>
<PRE>
public void <B>setWeightByDistance</B>(boolean&nbsp;b)</PRE>
<DL>
<DD>Set the nearest neighbour weighting method<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>b</CODE> - true nearest neighbours are to be weighted by distance.</DL>
</DD>
</DL>
<HR>

<A NAME="getWeightByDistance()"><!-- --></A><H3>
getWeightByDistance</H3>
<PRE>
public boolean <B>getWeightByDistance</B>()</PRE>
<DL>
<DD>Get whether nearest neighbours are being weighted by distance<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>m_weightByDiffernce</DL>
</DD>
</DL>
<HR>

<A NAME="getOptions()"><!-- --></A><H3>
getOptions</H3>
<PRE>
public java.lang.String[] <B>getOptions</B>()</PRE>
<DL>
<DD>Gets the current settings of ReliefFAttributeEval.<DD><DL>
<DT><B>Specified by: </B><DD><CODE><A HREF="../../weka/core/OptionHandler.html#getOptions()">getOptions</A></CODE> in interface <CODE><A HREF="../../weka/core/OptionHandler.html">OptionHandler</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>an array of strings suitable for passing to setOptions()</DL>
</DD>
</DL>
<HR>

<A NAME="toString()"><!-- --></A><H3>
toString</H3>
<PRE>
public java.lang.String <B>toString</B>()</PRE>
<DL>
<DD>Return a description of the ReliefF attribute evaluator.<DD><DL>
<DT><B>Overrides:</B><DD><CODE>toString</CODE> in class <CODE>java.lang.Object</CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>a description of the evaluator as a String.</DL>
</DD>
</DL>
<HR>

<A NAME="buildEvaluator(weka.core.Instances)"><!-- --></A><H3>
buildEvaluator</H3>
<PRE>
public void <B>buildEvaluator</B>(<A HREF="../../weka/core/Instances.html">Instances</A>&nbsp;data)
                    throws java.lang.Exception</PRE>
<DL>
<DD>Initializes a ReliefF attribute evaluator.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../weka/attributeSelection/ASEvaluation.html#buildEvaluator(weka.core.Instances)">buildEvaluator</A></CODE> in class <CODE><A HREF="../../weka/attributeSelection/ASEvaluation.html">ASEvaluation</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>data</CODE> - set of instances serving as training data<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if the evaluator has not been 
 generated successfully</DL>
</DD>
</DL>
<HR>

<A NAME="evaluateAttribute(int)"><!-- --></A><H3>
evaluateAttribute</H3>
<PRE>
public double <B>evaluateAttribute</B>(int&nbsp;attribute)
                         throws java.lang.Exception</PRE>
<DL>
<DD>Evaluates an individual attribute using ReliefF's instance based approach.
 The actual work is done by buildEvaluator which evaluates all features.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../weka/attributeSelection/AttributeEvaluator.html#evaluateAttribute(int)">evaluateAttribute</A></CODE> in class <CODE><A HREF="../../weka/attributeSelection/AttributeEvaluator.html">AttributeEvaluator</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>attribute</CODE> - the index of the attribute to be evaluated<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if the attribute could not be evaluated</DL>
</DD>
</DL>
<HR>

<A NAME="resetOptions()"><!-- --></A><H3>
resetOptions</H3>
<PRE>
protected void <B>resetOptions</B>()</PRE>
<DL>
<DD>Reset options to their default values<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="main(java.lang.String[])"><!-- --></A><H3>
main</H3>
<PRE>
public static void <B>main</B>(java.lang.String[]&nbsp;args)</PRE>
<DL>
<DD>Main method for testing this class.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>args</CODE> - the options</DL>
</DD>
</DL>
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