what level of hierarchical linear modeling is a linear model? how many interactions in a linear model how many interactions in the hierarchical linear model between urbanicity and race? which is a relationship between school-level race and the proportion of reading proficient students how many pairs of variables are in a hierarchical linear model? what is the relationship between race and urbanicity what is the relationship between urbanicity and race in a hierarchical linear model? what is the relationship between urbanicity and race how many interactions between race and urbanicity does the school level relationship between race and urbanicity vary by the urbanicity of the school? how many interactions between race and urbanicity in a linear model how many interaction of urbanicity and race are in a linear model what kind of relationship has to school level between race and urbanicity how many interaction terms does it take to model urbanicity what is the limit for the double summation for the interaction term between urbanism and race? how to find the relationship between urbanicity and race what is the maximum number of interactions between urbanicity and race in a linear model what is the relationship between urbanicity and race in a linear model? what is the relationship between race and urbanicity in sociology how many interactions in a linear model between urbanicity and race?