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Randy Neil Biostats 32: USMLE Biostats Shorts - Less than 1 minute
Episode Notes
USMLE purpose: Rapid-review a single biostats shortcut in Anki-card style.
How to use this page
- Identify whether the question is about disease status or test result.
- Choose sensitivity/specificity vs PPV/NPV.
- Open the toggle to confirm.
Episode metadata
| Field | Details |
| Episode | Randy Neil Biostats 32 |
| Topic | Biostats short |
| Runtime | 1 min |
| Published | 2024-02-04 |
| Source | Open YouTube video |
One-liner
If disease status is known first, think sensitivity/specificity; if test result is known first, think PPV/NPV.
Disease present → test positive?
Sensitivity.
Test positive → disease present?
Positive predictive value.
Extra practice
A question says, “Among patients with disease, how many test positive?” Which metric is this?
Reveal answer & explanation
Sensitivity. Disease status is known first, and the question asks whether the test catches it.