In an ex post facto design, one may employ matching by
A) matching subjects from one population with subjects from another population; or
B) matching pairs within a single population.

Question

Quizplus · Accepted Answer

Matching pairs within a single population is the best choice in an ex post facto design because it allows for greater control over extraneous variables and reduces the risk of selection bias. Matching subjects from one population with subjects from another population may result in significant differences between the groups that cannot be controlled for, leading to invalid conclusions. Matching pairs within a single population helps to ensure that the groups being compared are as similar as possible, allowing for more accurate comparisons.

In an Ex Post Facto Design, One May Employ Matching