Line Chart
Updated 2026-08-15
INTRODUCTION
English translation pending.
CORE DEFINITION
A line chart plots a measured variable against an ordered dimension, usually time, and connects successive points with straight segments. Its lineage runs from William Playfair's late eighteenth-century statistical graphics, and its core claim is that position along a continuous axis is read more accurately than the height of bars or the area of shapes. The qualification is that the horizontal axis must be genuinely ordered: used over unordered categories, a line implies a continuity that does not exist. Slope and inflection carry the meaning, so scaling choices can create or hide a trend.
SCAFFOLDING EFFECT
Reduce cognitive load
- Read the slope: judge direction and rate of change rather than a single value. - Mark inflections: circle where the trend bends, since turning points carry the decision. - Guard the axis: verify the horizontal dimension is genuinely ordered before drawing a line.
Anchor fast decisions
The visual system is tuned to detect direction and change in a contour, so a connected line lets a reader estimate rate and spot a bend without comparing numbers. Each segment's slope encodes the change between two adjacent periods, and the sequence of slopes forms a shape the eye parses instantly. Because the encoding is continuous, it also promises continuity in the data; that promise is either fulfilled by an ordered axis or violated by a categorical one.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Line_chartverified
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