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Emerg Med J 18:276-282 doi:10.1136/emj.18.4.276
  • An introduction to statistics

Article 8. An introduction to hypothesis testing. Non-parametric comparison of two groups—1

Table 1

Contrast of parametric and non-parametric tests in two group comaparisons

Parametric Non-parametric
Assumptions Normal distribution Depends on test
Uniform variance
Data Paired and unpaired data Depends on test
Significance Assessed Assessed
Small differences Detected Missed
Size of the difference Can be calculated Cannot be calculated

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