<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" dir="ltr"><head><table cellpadding=0 cellspacing=0><tr><td><img src="icon:///24/lightbulb_on.png" /></td><td width="5"></td><td><h2 class="firstHeading" id="firstHeading">Find Threshold</h4></td></tr></table><hr noshade="true"></head>
<body class="mediawiki ltr ns-0 ns-subject page-Find_Threshold skin-monobook">
<div id="content">
	
	
	
	<div id="bodyContent">
		
		
		
		
<div id="synopsis">
<h4>
<span class="mw-headline" id="Synopsis">Synopsis</span>
</h4>
<p>
Finds a threshold for given prediction confidences (soft predictions) , costs and distributional information in order to turn it into a crisp classification. The optimization step is based on ROC analysis.
</p>
</div><br/><h4> <span class="mw-headline" id="Description"> Description </span>
</h4>
<p>This operator finds the best threshold for crisp classifying based on user defined costs.


</p><br/><h4> <span class="mw-headline" id="Input"> Input </span>
</h4>

<ul class="ports">
<li> <b>example set</b>: <i>expects:</i> ExampleSet, <i>expects:</i> ExampleSet
</li>
</ul><br/><h4> <span class="mw-headline" id="Output"> Output </span>
</h4>

<ul class="ports">
<li> <b>example set</b>:
</li>
<li> <b>threshold</b>:
</li>
</ul><br/><h4> <span class="mw-headline" id="Parameters"> Parameters </span>
</h4>

<ul class="ports">
<li> <b>misclassification costs first</b>:  The costs assigned when an example of the first class is classified as one of the second.
</li>
<li> <b>misclassification costs second</b>:  The costs assigned when an example of the second class is classified as one of the first.
</li>
<li> <b>show roc plot</b>:  Display a plot of the ROC curve.
</li>
<li> <b>use example weights</b>:  Indicates if example weights should be used.
</li>
<li> <b>roc bias</b>:  Determines how the ROC (and AUC) are evaluated: Count correct predictions first, last, or alternatingly
</li>
</ul><br/><h4> <span class="mw-headline" id="ExampleProcess"> ExampleProcess </span>
</h4><br/><div>
</div>
</body>
</html>
