If a study describes the "difference in differences," what is the minimum number of variables the researchers were studying?
A)1
B)2
C)3
D)4

Question

Quizplus · Accepted Answer

The "difference in differences" technique involves comparing changes in an outcome variable over time between two groups, usually a treatment and a control group. Therefore, at minimum, there must be two variables: the treatment/control group variable and the outcome variable being measured.

If a Study Describes the "Difference in Differences," What Is