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specialized family
slope
Two-point comparison with lines connecting before/after.
Each line connects a "before" value (left) to an "after" value (right). The slope shows direction of change; the eye sorts winners (rising) from losers (falling).
When to use
Two-period comparison across many entities where the direction of change is the story.
When NOT to use
3+ time points (use line) or absolute values matter more than change (use grouped bars).
Rhetorical roles
- compare
- evolve
Variants & related
Required primitives
- has_data_labels
- has_axis_titles
Optional primitives
- has_legend
Common anti-patterns
- spaghetti-too-many-series
Disambiguation rules
- Two columns of dots connected by lines.
- If both ends are points (with no horizontal continuity), it is dumbbell.