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
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View the accompanying screencast: [1] |
| 1st/2nd variable | Nominal | Ordinal | Interval/Ratio |
|---|---|---|---|
| Nominal | Clustered bar chart Chi-squared (X2), Phi (φ) or Cramer's V |
← Treat as for | Clustered bar chart or scatterplot Point bi-serial correlation (rpb) |
| Ordinal | Clustered bar chart or scatterplot Spearman's Rho (rs) or Kendall's Tau |
←↑ Treat as for | |
| Interval/Ratio | Scatterplot Product-moment correlation (r) |