Intended for healthcare professionals

Endgames Statistical question

Simple associations

BMJ 2008; 337 doi: (Published 10 September 2008) Cite this as: BMJ 2008;337:a197
  1. John Fletcher, clinical epidemiologist
  1. 1BMJ, London WC1H 9JR
  1. jfletcher{at}

    How would you best assess the degree of linear association between two continuous variables?

    • a) Scatter plot

    • b) Odds ratio

    • c) Bar chart

    • d) Correlation


    d—Correlation measures the degree to which two variables are linearly related.

    A scatter plot would display graphically the association between two continuous variables. The x axis displays values for one …

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