Statistics
Two Categorical Variables
November 14, 2008
Outline
1. Setting: two categorical variables
2. Example: popular kids
Students were in 3 school districts in Ingham and Clinton Counties in Michigan. The
school districts are rural, suburban, and urban. The students are in grades 4–6. The
students were asked what was most important to them: make good grades, be popular,
or be good in sports. (Chase and Dummer, “The Role of Sports as a Social Determinant
for Children”)
3. Contingency tables
4. Marginal distributions
The distribution of each variable separately
5. Conditional distributions
The distribution of one variable for a fixed value of the other variable