Friday, June 18, 2010

Statistical Tests

On the USMLE, you will most likely be presented with a research design and according to the variables, you will be asked which statistical test to use.

2 interval variables: Pearson's correlation
2 ordinal variables: Spearman correlation
2 nominal variables: Chi-square
Both nominal and interval variables:
  • 2 groups: t-test
  • more than 2 groups: ANOVA
A mnemonic for interval vs. nominal is PINK:
Pearson = Interval
Nominal = Khi square (Chi square)

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