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weka是机器学习和数据挖掘领域最有影响力的开源项目之一

<DT><B>Returns:</B><DD>tip text for this property suitable for
 displaying in the explorer/experimenter gui</DL>
</DD>
</DL>
<HR>

<A NAME="setNumToSelect(int)"><!-- --></A><H3>
setNumToSelect</H3>
<PRE>
public void <B>setNumToSelect</B>(int&nbsp;n)</PRE>
<DL>
<DD>Specify the number of attributes to select from the ranked list
 (if generating a ranking). -1
 indicates that all attributes are to be retained.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../weka/attributeSelection/RankedOutputSearch.html#setNumToSelect(int)">setNumToSelect</A></CODE> in interface <CODE><A HREF="../../weka/attributeSelection/RankedOutputSearch.html" title="interface in weka.attributeSelection">RankedOutputSearch</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>n</CODE> - the number of attributes to retain</DL>
</DD>
</DL>
<HR>

<A NAME="getNumToSelect()"><!-- --></A><H3>
getNumToSelect</H3>
<PRE>
public int <B>getNumToSelect</B>()</PRE>
<DL>
<DD>Gets the number of attributes to be retained.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../weka/attributeSelection/RankedOutputSearch.html#getNumToSelect()">getNumToSelect</A></CODE> in interface <CODE><A HREF="../../weka/attributeSelection/RankedOutputSearch.html" title="interface in weka.attributeSelection">RankedOutputSearch</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the number of attributes to retain</DL>
</DD>
</DL>
<HR>

<A NAME="getCalculatedNumToSelect()"><!-- --></A><H3>
getCalculatedNumToSelect</H3>
<PRE>
public int <B>getCalculatedNumToSelect</B>()</PRE>
<DL>
<DD>Gets the calculated number of attributes to retain. This is the
 actual number of attributes to retain. This is the same as
 getNumToSelect if the user specifies a number which is not less
 than zero. Otherwise it should be the number of attributes in the
 (potentially transformed) data.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../weka/attributeSelection/RankedOutputSearch.html#getCalculatedNumToSelect()">getCalculatedNumToSelect</A></CODE> in interface <CODE><A HREF="../../weka/attributeSelection/RankedOutputSearch.html" title="interface in weka.attributeSelection">RankedOutputSearch</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="selectionThresholdTipText()"><!-- --></A><H3>
selectionThresholdTipText</H3>
<PRE>
public java.lang.String <B>selectionThresholdTipText</B>()</PRE>
<DL>
<DD>Returns the tip text for this property
<P>
<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="setSelectionThreshold(double)"><!-- --></A><H3>
setSelectionThreshold</H3>
<PRE>
public void <B>setSelectionThreshold</B>(double&nbsp;threshold)</PRE>
<DL>
<DD>Set the threshold by which the AttributeSelection module can discard
 attributes.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>threshold</CODE> - the threshold.</DL>
</DD>
</DL>
<HR>

<A NAME="getSelectionThreshold()"><!-- --></A><H3>
getSelectionThreshold</H3>
<PRE>
public double <B>getSelectionThreshold</B>()</PRE>
<DL>
<DD>Returns the threshold so that the AttributeSelection module can
 discard attributes from the ranking.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</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.
<P>
<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" title="interface in weka.core">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. <p/>

   <!-- options-start -->
 Valid options are: <p/>
 
 <pre> -R &lt;0 = forward | 1 = backward race | 2 = schemata | 3 = rank&gt;
  Type of race to perform.
  (default = 0).</pre>
 
 <pre> -L &lt;significance&gt;
  Significance level for comaparisons
  (default = 0.001(forward/backward/rank)/0.01(schemata)).</pre>
 
 <pre> -T &lt;threshold&gt;
  Threshold for error comparison.
  (default = 0.001).</pre>
 
 <pre> -A &lt;attribute evaluator&gt;
  Attribute ranker to use if doing a 
  rank search. Place any
  evaluator options LAST on the
  command line following a "--".
  eg. -A weka.attributeSelection.GainRatioAttributeEval ... -- -M.
  (default = GainRatioAttributeEval)</pre>
 
 <pre> -F &lt;0 = 10 fold | 1 = leave-one-out&gt;
  Folds for cross validation
  (default = 0 (1 if schemata race)</pre>
 
 <pre> -Q
  Generate a ranked list of attributes.
  Forces the search to be forward
 . and races until all attributes have
  selected, thus producing a ranking.</pre>
 
 <pre> -N &lt;num to select&gt;
  Specify number of attributes to retain from 
  the ranking. Overides -T. Use in conjunction with -Q</pre>
 
 <pre> -T &lt;threshold&gt;
  Specify a theshold by which attributes
  may be discarded from the ranking.
  Use in conjuction with -Q</pre>
 
 <pre> -Z
  Verbose output for monitoring the search.</pre>
 
 <pre> 
 Options specific to evaluator weka.attributeSelection.GainRatioAttributeEval:
 </pre>
 
 <pre> -M
  treat missing values as a seperate value.</pre>
 
   <!-- options-end -->
<P>
<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" title="interface in weka.core">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="getOptions()"><!-- --></A><H3>
getOptions</H3>
<PRE>
public java.lang.String[] <B>getOptions</B>()</PRE>
<DL>
<DD>Gets the current settings of BestFirst.
<P>
<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" title="interface in weka.core">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="search(weka.attributeSelection.ASEvaluation, weka.core.Instances)"><!-- --></A><H3>
search</H3>
<PRE>
public int[] <B>search</B>(<A HREF="../../weka/attributeSelection/ASEvaluation.html" title="class in weka.attributeSelection">ASEvaluation</A>&nbsp;ASEval,
                    <A HREF="../../weka/core/Instances.html" title="class in weka.core">Instances</A>&nbsp;data)
             throws java.lang.Exception</PRE>
<DL>
<DD>Searches the attribute subset space by racing cross validation
 errors of competing subsets
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../weka/attributeSelection/ASSearch.html#search(weka.attributeSelection.ASEvaluation, weka.core.Instances)">search</A></CODE> in class <CODE><A HREF="../../weka/attributeSelection/ASSearch.html" title="class in weka.attributeSelection">ASSearch</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>ASEval</CODE> - the attribute evaluator to guide the search<DD><CODE>data</CODE> - the training instances.
<DT><B>Returns:</B><DD>an array (not necessarily ordered) of selected attribute indexes
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if the search can't be completed</DL>
</DD>
</DL>
<HR>

<A NAME="rankedAttributes()"><!-- --></A><H3>
rankedAttributes</H3>
<PRE>
public double[][] <B>rankedAttributes</B>()
                            throws java.lang.Exception</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../weka/attributeSelection/RankedOutputSearch.html#rankedAttributes()">RankedOutputSearch</A></CODE></B></DD>
<DD>Returns a X by 2 list of attribute indexes and corresponding
 evaluations from best (highest) to worst.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../weka/attributeSelection/RankedOutputSearch.html#rankedAttributes()">rankedAttributes</A></CODE> in interface <CODE><A HREF="../../weka/attributeSelection/RankedOutputSearch.html" title="interface in weka.attributeSelection">RankedOutputSearch</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the ranked list of attribute indexes in an array of ints
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if the ranking can't be produced</DL>
</DD>
</DL>
<HR>

<A NAME="toString()"><!-- --></A><H3>
toString</H3>
<PRE>
public java.lang.String <B>toString</B>()</PRE>
<DL>
<DD>Returns a string represenation
<P>
<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 string representation</DL>
</DD>
</DL>
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