Intercepts, various constraints, and even custom specifications can also be specified, e.g.:
intercept <- c("mpg", "cyl", "disp")
constraint.equal <- list(b1 = "(b2 + b3)^2")
constraint.smaller <- list(b1 = "exp(b2 + b3)")
constraint.larger <- list(b1 = "exp(b2 + b3)")
custom <- "y1 + y2 ~ f1 + f2 + x1 + x2"
model.custom <- write_lavaan(
intercept = intercept, constraint.equal = constraint.equal,
constraint.smaller = constraint.smaller,
constraint.larger = constraint.larger, custom = custom
)
cat(model.custom)## ##################################################
## # [------------------Intercepts------------------]
##
## mpg ~ 1
## cyl ~ 1
## disp ~ 1
##
## ##################################################
## # [-----------------Constraints------------------]
##
## b1 == (b2 + b3)^2
## b1 < exp(b2 + b3)
## b1 > exp(b2 + b3)
##
## ##################################################
## # [------------Custom Specifications-------------]
##
## y1 + y2 ~ f1 + f2 + x1 + x2