Line Graph

Math Glossary

A resource for WE & Friends Mathematics and Science Projects

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This glossary is far from complete. We are constantly adding math terms.
For instructions on adding new terms, please refer to Math Glossary Main Page

Definition

Line Graph A graph used to represent the relationship between two continuous variables. Similar to a bar graph in which the height of each bar is represented by a single point (instead of the bar), with each of these points connected by a line. Best used to show change over time. Use a graph with 2 or more lines, with each line representing a different group or population, to visually display differences among the groups.

Tip: Be careful NOT to use a line graph when the X-axis is a categorical (also called nominal or qualitative) variable. If the X-axis variable represents distinct groups (e.g., different schools) use a bar graph instead.

Examples

Include an example that shows how limiting the scale can lead to distorted interpretations.

Web Resources

Statistics Canada - Line graphs Line Graphs, by David Lane Create a Graph, free online graph creation tool at the website for the National Center for Education Statistics (NCES)