Quick reminder parametric - nonparametric relationship
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This document provides guidance on choosing between parametric and non-parametric statistical tests. It first considers whether both variables are scaled and their distributions are normal; if so, a parametric test is suitable. If one variable is ordinal or nominal, or one distribution is skewed, a non-parametric test should be used. It further narrows the choice depending on whether both sample sizes are greater than 30.
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Quick reminder parametric - nonparametric relationship
- 1. How to decide to run a parametric or non-parametric test Are both variables scaled? Are both distributions Normal? Both Scaled At least 1 variable is Ordinal, or Nominal Both Normal At least 1 Skewed Choose a Parametric Test Are both sample sizes greater than 30? Both Greater than 30 Choose a Non-Parametric Test At least 1 is Less than 30