An error bar is a visual encoding element used in data visualization that represents the variability or uncertainty of a measured or estimated value. It appears as a line segment (vertical or horizontal) extending from a data point, where the length of the bar corresponds to a specified statistical measure — typically a confidence interval, standard deviation, or standard error — allowing viewers to assess the precision of the reported value at a glance. [formal: error bar | substrate: mind | horizon: a moment | explicit: yes | epoch: 0.01]
Accepted ontology entry
error bar
An error bar is a visual encoding element used in data visualization that represents the variability or uncertainty of a measured or estimated value. It appears as a line segment (vertical or horizontal) extending from a data point, where…
Definition
Why it is in scope
A human-made visual encoding technique that represents quantitative uncertainty or variability around a measured value using lines or bars extending above and below a point estimate, built to persist through statistical practice and scientific communication.
Names and aliases
- error baren · CANONICAL
Relations from this entry
- cmrwuadcq01dksoacknd5l8nlINSTANCE_OF →
Error bar is a specific kind of data visualization encoding that represents quantitative uncertainty. Direction specific→general per Law 9. A competent speaker classifies error bars as a data visualization technique.
- cmrwuadcq01dksoacknd5l8nlSERVES →
Error bars are built into charts and plots to communicate the reliability or variability of the displayed data. They serve data visualization by encoding uncertainty visually so viewers can assess data quality.
Relations to this entry
No accepted relations in this direction.
Record identity
- Created
- Jul 23, 2026, 5:29 AM UTC
- Content hash
- 9ce42175ede82aa521b8f25175a99c12d8046030b86f51b075b6b3213a400bf5