Hello Statalist,

I am building a multilevel model to test whether an environmental exposure is linked with individual's weight/change in weight over time.

My dataset comprises 3000 individuals nested within 120 community clusters (clusterid) who were measured at five time points (time). The outcome variable is weight. I need to control for two fixed covariates measured at the individual level (inc and mat_ill). The independent variable of interest is measured at the cluster level (env_exp), and I also need to include two fixed cluster-level covariates (alloc and dens).

Is the following code correct for measuring the effects of env_exp and its interaction with time on weight?

mixed weight inc mat_ill alloc dens env_exp time env_exp#time || clusterid: time

Many thanks!