. webuse lung, clear
(Fictional data on lung transplant)
{\smallskip}
. 
. global cvars bmip heightp o2amt lungals centervol walkdist      ///
>         bmid heightd distd lungpo2 hratio ischemict
{\smallskip}
. global fvars diabetesp karn racep sexp lifesvent assisvent      ///
>         o2rest raced smoked cmv deathcause diabetesd            ///
>         expandd sexd lungalloc genderm racem
{\smallskip}
. 
. global controls c.(\$cvars)\#i.(\$fvars)
{\smallskip}
. 
. global catecovars c.(\$cvars) i.(\$fvars)
{\smallskip}
