An advantage of matching over holding a variable constant is that
A)it may restrict the generalizability of the results.
B)within a group the confounding variable does not vary.
C)for each individual in one group there is a comparable individual in each of the other groups who has the same value on the confounding variable.
D)all individuals within a group have the same value on the confounding variable.

Question

Quizplus · Accepted Answer

Matching ensures that for each individual in one group, there is a comparable individual in each of the other groups who has the same value on the confounding variable. This helps to eliminate the potential impact of the confounding variable on the outcome variable. Option A is incorrect because matching does not necessarily restrict the generalizability of the results. Option B is incorrect because it is not necessary for the confounding variable to be constant within a group. Option D is incorrect because matching does not necessarily ensure that all individuals within a group have the same value on the confounding variable.

An Advantage of Matching Over Holding a Variable Constant Is