observablehq / observablehq/plot
Cumulative group?
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enhancement
- Dominant language
- HTML
- Stars
- 5.4k
- Forks
- 244
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Description
I think the group transform could support a cumulative option, as the bin transform does. It’s less rarely needed since group is sometimes used with a categorical dimension, but it should make sense with an ordinal dimension.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by comparing the existing group and bin transforms, especially how bin handles a cumulative option. Clarify the intended behavior for ordinal dimensions and define what the cumulative group output should be before implementing it; done means the option works consistently without changing categorical grouping unexpectedly.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- d3
- Domain
- data-visualization
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100