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Table: Graphical and statistical measures of association by level of measurement

1st/2nd variable

Nominal

Ordinal

Interval/Ratio

Nominal

Clustered bar-graph
Chi-squared (X2),
Phi (¿) or Cramer's V

Clustered bar-graph
Chi-squared  (X2),
Phi (¿) or Cramer's V

Scatterplot, bar chart or error-bar chart
Point bi-serial correlation (rpb)

Ordinal

 

Scatterplot or clustered bar chart
Spearman's Rho (http://en.wikipedia.org/wiki/Spearman's_rank_correlation_coefficient) (rs) or Kendall's Tau

<^ Recode?
Scatterplot
Point bi-serial (rpb)
or Spearman's Rho or Kendall's Tau

Interval/Ratio

 

 

Scatterplot
Product-moment correlation (r)

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