source: orange/docs/widgets/rst/visualize/surveyplot.rst @ 11778:ecd4beec2099

Revision 11778:ecd4beec2099, 2.5 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.. _Survey Plot:
2
3Survey Plot
4===========
5
6.. image:: ../../../../Orange/OrangeWidgets/Visualize/icons/SurveyPlot.svg
7
8Displays a Survey Plot.
9
10Signals
11-------
12
13Inputs:
14   - Examples (ExampleTable)
15      Input data set.
16   - Attribute Selection List
17      List of attributes to be shown in the visualization.
18
19
20Outputs:
21   - Attribute Selection List
22      List of attributes used in the visualization.
23
24
25Description
26-----------
27
28A survey plot is a simple multi-attribute visualization technique that can help
29to spot correlations between any two variables especially when the data is
30sorted according to a particular dimension. Each horizontal splice in a plot
31corresponds to a particular data instance. The data on a specific attribute is
32shown in a single column, where the length of the line corresponds to the
33dimensional value. When data includes a discrete or continuous class, the
34slices (data instances) are colored correspondingly.
35
36Implementation in Orange supports sorting by two selected attributes
37(:obj:`Sorting`). The attributes shown in the plot are listed in
38:obj:`Shown attributes` box, all other appear in the list of
39:obj:`Hidden attributes`.
40
41Below is a snapshot of survey plot widget for an Iris. Plot nicely shows that
42petal width and length and sepal length are correlated. It is also very clear
43that Iris-setosa can be classified based on petal length or width alone, while
44for the Iris versicolor and virginica there is some ambiguity with some
45potential outliers, one of which is highlighted in the snapshot.
46
47.. image:: images/SurveyPlot-Iris.png
48
49Values of the attributes may be scaled independently, for each attribute at
50the time, or globally, using the information from all of the attributes This
51option is controlled through :obj:`Global values scaling` check box. Switching
52it on results in a plot shown below; notice that the leafs have smalled widths
53than lengths, and the ratio is bigger with petal leafs. With
54:obj:`Example tracking` on, mousing over the plot would bring a box around the
55row representing a single data instance, which would with :obj:`Show legend`
56display the information about the values of particular instance (just like in
57the snapshot aboce). The attributes appearing in the attribute list may be
58ordered according to selected criteria. :obj:`Tooltips settings` controls the
59amount of information displayed in the data instance balloon (essentially, one
60can change between including the information of only visualized attributes, or
61all the attributes in the data set).
62
63.. image:: images/SurveyPlot-Settings.png
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