First of all, thanks to the developers of jamovi for such an awesome stats package!

I've been trying to use the GAMLj module in jamovi to run a mixed effects model. This is for a behavioural experiment where I want to see whether anxiety scores can account for sensitivity scores in a psychophysics task.

The dependent variable is emotion sensitivity (continuous). The fixed factors here are (2) exposure time (it has 7 levels of increasing durations, so ordinal), and anxiety score (continuous, from 0 to 100). The random effect is participant. So the model is something like this:

emotion_sensitivity ~ anxiety_score + exposure_time + anxiety_score*exposure_time + (1+ exposure_time|Participant)

How can I do this with GAMLj? I've tried many times, and every time it gives me an error message:

"number of observations (=224) <= number of random effects (=224) for term (0 + exposure_time|Participant); the random-effects parameters and the residual variance (or scale parameter) are probably unidentifiable."

Please, any help. Any ideas?

Thanks!!

Renzo