Quick question: when you say "subject-level effects", this is because that's how LMMS are conventionally used in this field, right? The random effect doesn't necessarily have to be associated with participants, correct? As far as I know in psychology for example random intercepts and slopes are introduced for items in a questionnaire.
Quick question: when you say "subject-level effects", this is because that's how LMMS are conventionally used in this field, right? The random effect doesn't necessarily have to be associated with participants, correct? As far as I know in psychology for example random intercepts and slopes are introduced for items in a questionnaire.