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Sequences sunburst (d3 v4)

(This is a minimal update of my original Sequences sunburst block, to work correctly with d3 v4. See the Observable version for d3 v5).

This example shows how it is possible to use a D3 sunburst visualization (partition layout) with data that describes sequences of events.

A good use case is to summarize navigation paths through a web site, as in the sample synthetic data file (visit_sequences.csv). The visualization makes it easy to understand visits that start directly on a product page (e.g. after landing there from a search engine), compared to visits where users arrive on the site's home page and navigate from there. Where a funnel lets you understand a single pre-selected path, this allows you to see all possible paths.


If you want to simply reuse this with your own data, here are some tips for generating the CSV file:

I created this example in my work at Google, but it is not part of any Google product. It is covered by the Apache license (see the LICENSE file).