What particular measure of correlation would be most appropriate for use with two variables measured at an ordinal level?

Answer 1

Spearman's Rho

Ordinal data comes in two general types. The first type of ordinal data is often called
continuous ordinal data. This type of data is found in situations where the researcher has a
relatively detailed set of rankings where the cases have been ranked in a relatively broad range of
categories and where the number or tied rankings is relatively small. Researchers working with
this type of ordinal data use Spearman's Rho to determine the level of correlation that exists
between variables.