source: orange/orange/doc/widgets/Associate/AssociationRulesFilter.htm @ 9399:6bbe263e8bcf

Revision 9399:6bbe263e8bcf, 3.3 KB checked in by mitar, 2 years ago (diff)

Renaming widgets catalog.

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1<html>
2<head>
3<title>Association Rules Viewer</title>
4<link rel=stylesheet href="../../../style.css" type="text/css" media=screen>
5<link rel=stylesheet href="../../../style-print.css" type="text/css" media=print></link>
6</head>
7
8<body>
9
10<h1>Association Rules Filter</h1>
11
12<img class="screenshot" src="../icons/AssociationRulesFilter.png">
13<p>A widget for printing out the rules and for their manual exploration and selection.</p>
14
15<h2>Channels</h2>
16
17<h3>Inputs</h3>
18
19<DL class=attributes>
20<DT>Association Rules</DT>
21<DD>A list of rules</DD>
22</dl>
23
24<h3>Outputs</h3>
25<DL class=attributes>
26<DT>Association Rules</DT>
27<DD>Selected rules</DD>
28
29</dl>
30
31<h2>Description</h2>
32
33<p>This widget can be used for three purposes:
34<ul><li>graphically showing the confidence and support of the induced rules</li>
35<li>selecting a subset of rules based on their confidence and support</li>
36<li>listing the induced rules and the corresponding measures of quality</li>
37</ul>
38</p>
39
40<img class="screenshot" src="AssociationRulesViewer.png" alt="Association Rules Viewer Widget" border=0>
41
42<P>The columns of the grid on the left hand side of the widget represent different supports and the rows represents confidences. The scale is given above the grid: for the case in this snapshot, support goes from 28% to 75% and the confidence ranges from 29% to 100%. Each cell is colored according to the number of rules with that particular support and confidence - the darker the cell, the more rules are inside it.</P>
43
44<P>You can select a part of the grid. In the snapshot we selected the rules with supports between 36% and 66% and confidences from 33% to 82%.</P>
45
46<P>When the widget receives certain data, it shows the area containing all the rules. You can <span class="option">Zoom</span> in to enlarge the selected part, push <span class="option">Show All</span> to see the region with the rules again, or <span class="option">No Zoom</span> to see the region with support and confidence from 0 to 1. <span class="option">Unselect</span> removes the selection.</P>
47
48<P>If nothing is selected, the widget outputs all rules.</P>
49
50<P>On the right hand side of the widget there is a list of the selected rules. The checkboxes above can be used to select the measures of rule quality that we are interested in. Let L, R and B be the number of examples that fit the left, the right and both sides of the rule, respectively, and N the total number of examples in the data set. The measures are then defined as follows
51<ul>
52<li>support = B / N</li>
53<li>confidence = B / L</li>
54<li>coverage = L / N</li>
55<li>strength = R / L</li>
56<li>lift = N * B / (L * R)</li>
57<li>leverage = N * B - L * R</li>
58</ul>
59</P>
60
61<P>With the buttons below you can <span class="option">Save Rules</span> into a tab-delimited file or <span class="option">Send Rules</span> to the widget connected to the output. The latter is only enabled if <span class="option">Send rules automatically</span> is unchecked. When it is checked, the rules are put on the widget's output automatically at every selection change.</P>
62
63<h2>Examples</h2>
64
65<P>This widget is used with the <a href="AssociationRules.htm">Association Rules</a> and maybe with a tree-like <a href="AssociationRulesTreeViewer.htm">Association Rules Tree Viewer</a>. The typical schema is shown below.</P>
66
67<img class="screenshot" src="AssociationRules-Schema.png" alt="Association Rules" border=0>
68
69</body>
70</html>
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