Survey research and design in psychology/Tutorials/Correlation/Types of correlation and level of measurement
Types of correlation and level of measurement
Graphical and statistical measures of association by level of measurement
View the accompanying screencast: [1] |
1st/2nd variable | Nominal | Ordinal | Interval/Ratio |
---|---|---|---|
Nominal | Clustered bar chart Chi-squared (X^{2}), Phi (φ) or Cramer's V |
← Treat as for | Clustered bar chart or scatterplot Point bi-serial correlation (r_{pb}) |
Ordinal | Clustered bar chart or scatterplot Spearman's Rho (r_{s}) or Kendall's Tau |
←↑ Treat as for | |
Interval/Ratio | Scatterplot Product-moment correlation (r) |