1. Relations in Categorical Data
Section 4.3

2. Marginal Distribution
Column and row totals
If not already given, always calculate these first
Percents are usually more informative than counts
Get percents by dividing row or column total by the table total

3. Conditional Distribution
Compare the response variable for the separate values of the explanatory variable
Distribution only refers to those things that satisfy the “condition”

4. Simpson’s Paradox
Refers to the reversal of the direction of a comparison or an association when data from several groups are combined to form a single group
Lurking variables in Simpson’s Paradox are categorical

5. Practice Problems
pg. 245 #
pg. 250 #

6. Chapter Review
pg. 257 #4.72, ,