AtlasSession 4L12: Introduction to measurement errors and diagnostic test accuracy studiesp.4–11, 53–54
Accuracy vs precision
- Study designs primer
- What is systematic error
- Accuracy vs precision
- Next: Random vs systematic error
Fig. 1
Repeat micro-CT scans of a hydroxyapatite phantom whose true density is 250 (mg HA/cm³)
Fig. 1: a target whose bullseye is the true density, 250 mg HA/cm³. No scans fired yet.
- Close to the truth?
- — (no scans fired yet: press Fire)
- Close together?
- — (no scans fired yet: press Fire)
- Pattern
- — (no scans fired yet: press Fire)
Agreement & Error Lab · First look
Level 1 · First look · Lecture 12 · p.4–11, 53–54
Tell 'close to the truth' from 'close to each other' using a target.
Define accuracy and precision, produce each of the four combinations, and link them to study size and systematic error.
Darts (the step you are on)
Hitting the bullseye is being right; landing darts close together is being consistent.
In darts, a dart in the bullseye is right, and darts that land close together are consistent. These 5 scans landed — (no scans fired yet: press Fire).