Hello,

I have tried searching for an answer to my question but have not be able to find one. I am running a multilevel model on Stata with a three way interaction and would like to use the contrast command to be able to report the interaction, however I am met with the following message:
factor scl90_tot not found in the list of covariates


My model is as follows:

Code:
mixed hr_mean i.sessie##i.sample##c.scl90_tot demo_age demo_sex || subjno: sample, cov(un) || sessie: sample, cov(un)
The model runs fine, but it somehow doesn't recognize scl90_tot for the contrast command.

Any suggestion as to how I could proceed? I have tried a few things but none have yielded any results.

Thank you in advance