The time point at which notifications are sent is then randomized per group, not by an individual (i.e., every individual in group A gets the notification at the same time point). It is desirable to allow randomization within groups. I.e. every individual in a group receives the notification at a different (randomized) time point within the chosen time window.
The time point at which notifications are sent is then randomized per group, not by an individual (i.e., every individual in group A gets the notification at the same time point). It is desirable to allow randomization within groups. I.e. every individual in a group receives the notification at a different (randomized) time point within the chosen time window.