source: orange/docs/widgets/rst/data/outliers.rst @ 11778:ecd4beec2099

Revision 11778:ecd4beec2099, 1.8 KB checked in by Ales Erjavec <ales.erjavec@…>, 5 months ago (diff)

Use new SVG icons in the widget documentation.

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1.. _Outliers:
2
3Outliers
4========
5
6.. image:: ../../../../Orange/OrangeWidgets/Data/icons/Outliers.svg
7
8Simple outlier detection by comparing distances between examples.
9
10Signals
11-------
12
13Inputs:
14   - Examples (ExampleTable)
15      Attribute-valued data set.
16   - Distance matrix
17      A matrix of example distances.
18
19Outputs:
20   - Outliers (ExampleTable)
21      Attribute-valued data set containing only examples that are outliers.
22      Meta attribute Z-score is added.
23   - Inliers (ExampleTable)
24      Attribute-valued data set containing only examples that are not
25      outliers. Meta attribute Z-score is added.
26   - Examples with Z-scores (ExampleTable)
27      Attribute-valued data set containing examples from input data with
28      corresponding Z-scores as meta attribute.
29
30
31
32
33Description
34-----------
35
36Outliers widget first computes distances between each pair of examples in input
37Examples. Average distance between example to its nearest examples is valued by
38a Z-score. Z-scores higher than zero denote an example that is more distant to
39other examples than average. Input can also be a distance matrix: in this case
40precalculated distances are used.
41
42Two parameters for Z-score calculation can be choosen: distance metrics and
43number of nearest examples to which example's average distance is computed.
44Also, minimum Z-score to consider an example as outlier can be set. Note, that
45higher the example's Z-score, more distant is the example from other examples.
46
47Changes are applied automatically.
48
49.. image:: images/Outliers.gif
50   :alt: Outliers
51
52Examples
53--------
54
55Below is a simple example how to use this widget. The input is fed
56directly from the :ref:`File` widget, and the output Examples with Z-score
57to the :ref:`Data Table` widget.
58
59.. image:: images/Outliers-Example1.gif
60   :alt: Schema with Outliers
61
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