source: orange/Orange/doc/widgets/Data/Outliers.htm @ 9671:a7b056375472

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Moved orange to Orange (part 2)

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1<html>
2<head>
3<title>Outliers</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>Outliers</h1>
11
12<img class="screenshot" src="../icons/Outliers.png">
13<p>Simple outlier detection by comparing distances between examples.</p>
14
15<h2>Channels</h2>
16
17<h3>Inputs</h3>
18
19<DL class=attributes>
20<DT>Examples (ExampleTable)</DT>
21<DD>Attribute-valued data set.</DD>
22</dl>
23
24<DL class=attributes>
25<DT>Distance matrix</DT>
26<DD>A matrix of example distances.</DD>
27</dl>
28
29<h3>Outputs</h3>
30
31<DL class=attributes>
32<DT>Outliers (ExampleTable)</DT>
33<DD>Attribute-valued data set containing only examples
34that are outliers. Meta attribute Z-score is added.</DD>
35</dl>
36
37<DL class=attributes>
38<DT>Inliers (ExampleTable)</DT>
39<DD>Attribute-valued data set containing only examples
40that are not outliers. Meta attribute Z-score is added.</DD>
41</dl>
42
43<DL class=attributes>
44<DT>Examples with Z-scores (ExampleTable)</DT>
45<DD>Attribute-valued data set containing examples from input data with
46corresponding Z-scores as meta attribute.</DD>
47</dl>
48
49
50
51<h2>Description</h2>
52
53<p>Outliers widget first computes distances between each pair of examples in input
54Examples. Average distance between example to its nearest examples is valued by a
55Z-score. Z-scores higher than zero denote an example that is more distant to other examples
56than average. Input can also be a distance matrix: in this case precalculated distances are used.</p>
57
58<p>Two parameters for Z-score calculation can be choosen: distance metrics and number of nearest examples to which
59example's average distance is computed. Also, minimum Z-score to consider an example as outlier
60can be set. Note, that higher the example's Z-score, more distant is the example from other examples. </p>
61
62<p>Changes are applied automatically.</p>
63
64<img class="screenshot" src="Outliers.gif" alt="Outliers" border=0>
65
66<h2>Examples</h2>
67
68<p>Below is a simple example how to use this widget. The input is fed
69directly from the <a href="File.htm">File</a> widget, and the output Examples with Z-score
70to the <a href="DataTable.htm">Data Table</a> widget.</p>
71
72<img src="Outliers-Example1.gif" alt="Schema with Outliers" class="schema">
73
74</body>
75</html>
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