To control for history effects in an interrupted time-series study, a researcher includes a comparison group that does not receive the treatment. What is one drawback to using this technique?
A) The comparison group may not be equivalent to the treatment group.
B) The comparison group is usually the same as the treatment group, and it is difficult for participants to "unlearn" the treatment.
C) The comparison group cannot be measured as often as the treatment group.
D) All of the above.

Question

Quizplus · Accepted Answer

Including a comparison group that does not receive the treatment can lead to issues if the comparison group is not equivalent to the treatment group, as differences in outcomes may be due to pre-existing differences rather than the treatment itself.

To Control for History Effects in an Interrupted Time-Series Study