There's no selection bias without selection. And selection is, of course, present in all studies. But for selection to cause bias under the null, it needs to be related to both treatment A and [...].
Answer
outcome Y
status
not learned
measured difficulty
37% [default]
last interval [days]
repetition number in this series
0
memorised on
scheduled repetition
scheduled repetition interval
last repetition or drill
Parent (intermediate) annotation
Open it There's no selection bias without selection. And selection is, of course, present in all studies. But for selection to cause bias under the null, it needs to be related to both treatment A and <span>outcome Y. <span>