Deneb Example - Distributions

Deneb/Vega-Lite has built-in “binning” ability and can create histograms from raw data to display distributions. Further, while Power BI only permits a single dataset to be provided to custom visuals, additional datasets can be created using Vega-Lite’s data generators. The example herein consists of a 20-bin histogram of IMDB movie ratings overlaying a parameterized normal distribution using data from a sequence generator.

This example illustrates a number of Deneb/Vega-Lite features, including:

0 - General:

  • use of a “params” block to create range input widgets for the normal distribution height coefficient, mean, and standard deviation
  • use of a “layer” block consisting of 2 sections: normal distribution, and histogram

1 - Normal Distribution:

2 - Histogram:

  • use of a “bar” mark with X encoding for binning (20) and Y encoding for aggregation (count)
      "name": "HISTOGRAM",
      "mark": {
        "type": "bar",
        "color": "#0F4C81",
        "opacity": 0.7,
        "tooltip": true
      "encoding": {
        "x": {
          "bin": {"maxbins": 20},
          "field": "IMDB Rating",
          "type": "quantitative",
          "title": "IMDB Rating",
          "scale": {"domain": [0, 10]}
        "y": {
          "aggregate": "count",
          "title": "Count"

The intent of this example is not to provide a finished visual, but rather to serve as a starting point for further custom visual development.

Also included is the sample PBIX using the movies JSON file provided on the Vega-Lite examples website.

This example is provided as-is for information purposes only, and its use is solely at the discretion of the end user; no responsibility is assumed by the author.

Deneb Examples - Distributions.pbix (1.5 MB)

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