Which of the following is NOT an advantage of a retrospective study?
A) Sample size required is relatively small compared to that of a prospective study.
B) Efficient when the outcome is rare.
C) Efficient when the outcome requires a long time to develop.
D) Investigators have control over the way the variables are collected.

Question

Quizplus · Accepted Answer

A retrospective study typically uses the data that are obtained before the initiation of the study. Thus, the investigators have no control over the way the variables are collected.

Which of the Following Is NOT an Advantage of a Retrospective