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.