source: orange/docs/widgets/rst/visualize/distributions.rst @ 11359:8d54e79aa135

Revision 11359:8d54e79aa135, 1.8 KB checked in by Ales Erjavec <ales.erjavec@…>, 14 months ago (diff)

Cleanup of 'Widget catalog' documentation.

Fixed rst text formating, replaced dead hardcoded reference links (now using
:ref:), etc.

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1.. _Distributions:
2
3Distributions
4=============
5
6.. image:: ../icons/Distributions.png
7
8Displays value distributions for a single attribute.
9
10Signals
11-------
12
13Inputs:
14   - Examples (ExampleTable)
15      Input data set.
16
17
18Outputs:
19   - (None)
20
21
22Description
23-----------
24
25Distributions displays the value distribution of either discrete or continuous
26attributes. If the data contains class, the distributions are conditioned on
27the class.
28
29.. image:: images/Distributions-Disc.png
30   :alt: Distribution for a discrete feature
31
32For discrete attributes, the graph displayed by the widget shows how many times
33(e.g., in how many data instances) each of the attribute values appear in the
34data. If the data contains a class variable, class distributions for each of
35the attribute values will be displayed as well (like in the snapshot above).
36The widget may be requested to display only value distributions for instances
37of certain class (:obj:`Outcomes`). For class-valued data sets, the class
38probability conditioned on a specific value of the attribute
39(:obj:`Target value`) may be displayed as well.
40
41.. image:: images/Distributions-Cont.png
42   :alt: Distribution for a continuous feature
43
44For continuous attributes, the attribute values are discretized and value
45distribution is displayed as a histogram. Notice that the :obj:`Number of bars`
46can be used to alter the discretization used. Class probabilities for the
47continuous attributes are obtained through loess smoothing, the appearance of
48the curve and inclusion of the confidence intervals are set in
49:obj:`Probability plot` settings.
50
51Notice that in class-less domains, the bars are displayed in gray and no
52additional information (e.g. conditional probabilities) are available.
53
54.. image:: images/Distributions-NoClass.png
55   :alt: Distribution with no class variable
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