I am doing Oaxaca decomposition in detail. The interpretation of the explained part of different variables is straightforward, also available in STATALIST posts. However, I not getting much information interpreting the unexplained part of different variables. Particularly for categorical variables. I show Mincer type equation that estimates discrimination between migrant and native.
Code:
xi: oaxaca logwage i.educ exper expr2 sex i.states i.occupation  i.industry marital_status, by(foreign) weight(1) detail
In the Unexplained part education and experience are positive and significant but states and occupations have a negative and significant sign. Is the unexplained part not interpretable in detail when there are categorical variables? How can we interpret?