Which of the following is used to assess the relationship between two ordinal variables ? 

The correct answer is Spearman's rho :

 Key Points

• Spearman's rho :
  • The Spearman rank-order correlation coefficient (Spearman's correlation, for short) is a nonparametric measure of the strength and direction of association that exists between two variables measured on at least an ordinal scale.
  • It is denoted by the symbol rs (or the Greek letter ρ, pronounced rho).

Additional Information

•  Chi-square
  • It is a statistical test used to examine the differences between categorical variables from a random sample in order to judge the goodness of fit between expected and observed results.
  • A chi-square test is a statistical test used to compare observed results with expected results. The purpose of this test is to determine if a difference between observed data and expected data is due to chance, or if it is due to a relationship between the variables you are studying.
• Cramér's V
  • It is an effect size measurement for the chi-square test of independence. It measures how strongly two categorical fields are associated. 
  • Cramer's V must lie between 0 (reflecting complete independence) and 1.0 (indicating complete dependence or association) between the variables.