Examples of Terminology Used in Discrete Rating Scales to Help Observers Classify Their Confidence and Use of Quasi Continuous Rating Scales
| Observer | ROC confidence scale |
| Discrete | |
| Chesters (12) | 0–5 (definitely not signal to definitely signal) |
| Langoltz (43) | 0–5 (definitely benign to definitely malignant) |
| Obuchowski (44) | 0–4 (normal to malignant) |
| Quasi continuous | |
| Chakraborty (3) | 0–100 (101-point scale) |
| Rockette et al. (17) | 0–100 (101-point scale) |
| Wagner et al. (18) | 0–100 (101-point scale) |
| Hadjiiski et al. (19) | 0–100 (101-point scale, rebinned to 0–5, 0–10, 0–20) |