In my data, I noticed that subjects have multiple participation sessions. There should only be 1 row per subject ID (1 group, date, time, LinkedInCondition). But, some have multiple rows with different group ID, date, time, and (for some) different conditions. In the screenshot, I am only presenting subject IDs with multiple rows.
I took a closer look at their responses. Some subjects are stopping part-way through the study, then coming back and starting it from the beginning at a later date and time. Some are on the same day and only minutes or an hour later (e.g., subject 98170). Other subjects go all the way through, then complete the study a second time at a later date (e.g., subject 82684).
I checked my script multiple times with collaborators, verifying that a group ID is randomly generated per session.
Has anyone else run into and resolved this issue? What is going on? How do I prevent subjects from starting / completing the study multiple times? It's a very short study, only 5 - 7 minutes.
