Test to measure relationship between variables

Based on the scale of the variables, different statistical methods are available to determine the relationship or association between the variables. Suitable graphs also provide more clarity on the relationship.

Nominal vs Nominal:
Chi-square, Phi, Cramer 's V                                                                          (Clustered Bar graph)

Nominal vs Ordinal :
Chi-square, Phi (2X2, 2X3, 3X2 tables), Cramer's V (> 3X3 table)           (Clustered Bar graph)

Nominal vs Interval / Ratio :
Point bi-serial correlation                                                                             (Scatter plot, Bar chart)


Ordinal vs Ordinal :
Spearman's Rho, Kendall's Tau                                                  (Scatter Plot, Clustered Bar Graph)

Ordinal vs Interval / Ratio :
Spearman's Rho, Kendall's Tau, Point bi-serial correlation                                      (Scatter Plot)

Interval/Ratio vs Interval/Ratio :
Pearson r                                                                                                             (Scatter Plot)

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