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FM Non-Linear Association

2.5 Relationships between two Numerical Variables

Guidelines to Analysing Numerical Associations

  • Begin with context: what does the data represent?
  • Identify the explanatory and response variables.
  • Assess the form of the association: is it linear, non-linear or is there no association.
  • If it is linear, assess the strength (strong, moderate or weak). Ideally, do this using the Pearson’s correlation coefficient (detailed in 2.6 Pearson’s Correlation Coefficient), however if the raw data is not available, a qualitative assessment will suffice.
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