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correlation family
scatter-with-trendlines
Scatter plus fitted trend line(s) calling out the relationship.
Same as scatter with explicit best-fit lines drawn through. The trendline turns "look at the cloud" into "here is the slope" — a step toward declarative storytelling.
When to use
Same as scatter, plus you want to call out the rate of change or compare slopes between sub-groups.
When NOT to use
Relationship is non-linear and you cannot fit a meaningful curve.
Rhetorical roles
- correlate
- forecast
Variants & related
Required primitives
- has_axis_titles
- has_trendline
Optional primitives
- has_legend
- has_data_labels
- has_source_note
Common anti-patterns
- mismatched-encoding
- unsourced-data
Disambiguation rules
- Dots PLUS a clearly drawn fitted line/curve through them.
- Trendline equation often labelled (R², slope, growth rate).