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Mixed (aka multilevel or hierarchical) models are linear models that include both fixed effects and random effects. They are used to model longitudinal or nested data.

3 votes
1 answer
70 views

Is random slope meaningful when the relevant fixed effect is not significant?

I am building a liner mixed model with the following syntax: $$ y \sim \text{run} + (1 + \text{run} \mid \text{subjects}) $$ The summary is as follows: The fixed effect of $\text{run}$ is not signifi …
3 votes
1 answer
38 views

If measured in different time across days, should it be crossed or nested random effects?

everyone. I have a dataset that happiness was measured in morning, afternoon and evening(time of day) across 3-6 days for each subject. My two questions are: If I care about the relationship between …
0 votes
0 answers
67 views

How to do moderated mediation analysis with linear mixed model with nested random effect?

I want to build a model like this. All variables are continuous variables. Each subject was measured for many times across days, so this should be done with a linear mixed model I guess. What's more, …
1 vote
1 answer
112 views

Should I contain time as a random variable in repeated measurement?

I have a dataset which contains happiness scores of several subjects, measured three times within a day (in morning, afternoon and evening) and repeated across several days. But during how many days h …
4 votes
0 answers
206 views

In linear mixed model, what if the dependent variable is repetitive for a random factor?

(1) Research background: My research design involves having each participant complete multiple trials to assess their happiness rating while simultaneously recording EEG data. Each participant has dif …