Which of the following is the main threat to internal validity in an interrupted time-series design?
A) statistical regression
B) history
C) experimental mortality
D) diffusion of treatment

Question

Quizplus · Accepted Answer

In an interrupted time-series design, the main threat to internal validity is history, as events occurring between the pre-intervention and post-intervention measurements can affect the outcome independently of the intervention.

Which of the Following Is the Main Threat to Internal