Vector of variable names. Optional but gives control of the
sequence of appearance of the variables. The argument can be given as a
character vector or formula, e.g. ~y1+y2 is equivalent to
c("y1","y2"). Alternatively the argument can be a formula specifying
a linear model.
...
Additional arguments to be passed to the low level functions
m <- lvm() # Empty modelm1 <- lvm(y~x) # Simple linear regressionm2 <- lvm(~y1+y2) # Model with two independent variables (argument)m3 <- lvm(list(c(y1,y2,y3)~u,u~x+z)) # SEM with three items