Hello researchers, I am very interested in knowing the differences and power, for example, of these nonparametric tests.
a) ordinal X ordinal
b) ordinal X nominal
c) nominal X nominal
At the moment I know that the Somer's D test is used for ordinal variables and depends on the chi square test to assume the existence of association. Authors such as (Muth, 2006) tell us that it is possible to use it in nominal and ordinal variables since it does not have an association direction.
On the other hand, if I present the case of a Sex(nominal with two categories) and Satisfaction (ordinal with 5 categories), where I supposedly have the first null category (0) of Satisfaction. Is it appropriate to eliminate that category to do the analysis? (Please see attached image)