Time-series designs are characterized by:
A) observations taken solely before the treatment.
B) observations of the same participant or similar participants.
C) a single observation comparing two or more groups.
D) a possibility of selection effects.

Question

Quizplus · Accepted Answer

Time-series designs involve taking multiple observations of the same participant or similar participants over time. This allows researchers to observe changes within the same individual or group before and after the treatment is introduced. Option A is incorrect because time-series designs involve observations taken both before and after the treatment. Option C is incorrect because time-series designs typically involve observations of a single group, rather than comparing multiple groups. Option D is not necessarily true for all time-series designs and is not a defining characteristic of this design.

Time-Series Designs Are Characterized By