Cloudera Docs

Dendrograms

Cloudera Data Visualization enables you to create Dendrogram visuals. Dendrograms are good at expressing hierarchical relationships in data. As the name derivation suggests (Greek 'dendro' for 'tree' and 'gramma' for 'drawing'), dendrograms are tree diagrams.

In the following example the NYC Taxi Data for year 2013 dataset is used. You can download a subset of this data for trips made within Staten Island boro, upload it, and create the dataset NYC Taxi Data.

For an overview of shelves that specify this visual, see Shelves for dendogram visuals.

  1. Start a new visual based on dataset NYC Taxi Data.
    For instructions, see Creating a visual.
  2. In the VISUALS menu, find and click Dendrogram.
    The shelves of the visual changed. They are now Dimensions, Measure, Tooltips, X Trellis, Y Trellis and Filters. The mandatory shelves are:
    • Dimensions: specify two dimensions, because there are at least two nodes on each branch
    • Measure; specify one measurement plotted on the branch between nodes
  3. Populate the shelves from the available fields (Dimensions and Measures) in the DATA menu.
    1. Under Dimensions, select Pickup Neighborhood and Dropoff Neighborhood, and add them to the Dimensions shelf.
    2. Under Measures, select Record Count and add it to the Measure shelf.
  4. To examine only the rides within Staten Island, add Pickup Boro and Dropoff Boro to the Filters shelf, and set them to a single value 'Staten Island'.
  5. Click REFRESH VISUAL.
    The new dendrogram visual appears.
  6. Click the pencil/edit icon next to the title of the visualization to enter a name for the visual.

    In this example, the title is changed to 'NYC Taxi - Dendrogram'. You can also add a brief description of the visual as a subtitle below the title of the visualization.

  7. At the top left corner of the Dashboard Designer, click SAVE.

To adjust the dendrogram display, check all the available settings for this visual.