I want to include 2 covariates that are group characteristics as fixed effects in predicting a variable that is at the individual level. How to include them in the lmer formula? At this point my random effects are given just by the intercept and my fixed effects are only individual level variables.
a <- lmer(DV ~ 1 + v1 + v2 + (1 | Team), data = dat)
Should they they be included as random effects?