USMLE purpose: Rapid-review a single biostats shortcut in Anki-card style.

How to use this page

1. Identify whether the statistic is about agreement, rank, or linear correlation.
2. Match to kappa, tau, or Pearson r.
3. Open the toggle to confirm.

• Episode metadata

One-liner

Agreement = kappa, ranked association = Kendall tau, linear correlation = Pearson r.

• Two raters agree beyond chance?
• Linear relationship between continuous variables?

Extra practice

Two physicians rank the same 20 cases from least severe to most severe. Which statistic best assesses association between the two rankings?

• Reveal answer & explanation