The following node is available in the Open Source KNIME predictive analytics and data mining platform version 2.7.1. Discover over 1000 other nodes, as well as enterprise functionality at http://knime.com.

Histogram (interactive)

Displays an interactive histogram view with different viewing options.The interactive histogram supports hiliting and the changing of the x axis and aggregation column on the fly.

The user can change the following view properties on the fly:

  1. X axis
  2. Aggregation column (Y axis)
  3. Aggregation method (count, summary, average)
  4. Number of bins for numerical attributes (incl. empty bars, excl. missing value )
  5. Bar size
  6. Show empty intervals
  7. Show missing value bar
  8. Layout
  9. Zooming
  10. ...
The bars are colored in proportion to the aggregation value. Hiliting is supported.

All automatically created bins, with exception to the first one, are left open intervals (a,b] where a is excluded and b is included in the interval. To cover all values the first interval is a closed interval [a,b] where a and b are included. In order to provide nicer bin intervals the left border is set to 0 if possible.

Please note: This node caches all data in the main memory to provide interactive functions. If you plan to visualize extremely large datasets the non interactive "Histogram" node may be better suited.

Only columns with a valid domain are available in this view. To set the domain use the DomainCalculator or ColumnFilter node!

Dialog Options

Display all rows
If selected the histogram view displays all rows of the incoming data.
No. of rows to display:
Defines the number of rows to be displayed in the histogram. This option is disabled if the 'Display all rows' option is selected.
Binning column:
This is the column to be shown on the x axis of the histogram view. For numerical values the number of bars can be adjusted later in the 'Bar settings' section of view properties.
Aggregation column
This is the column to be used as the bar value and displayed on the y axis. Only numerical values with a valid domain are allowed. The aggregation method can be adjusted later in the 'Aggregation setting' section of view properties .

Ports

Input Ports
0 The data table to be displayed.

Views

Interactive Histogram View
Displays the data in an interactive histogram view.
This node is contained in KNIME Base Nodes provided by KNIME GmbH, Konstanz, Germany.