Build a object or formula to use with covset — build

build_covform formulates then parses a formula that can be used in a covset. build_covobj just assembles the object directly.

Usage

build_covform(
  var,
  dist,
  args,
  lower = NULL,
  upper = NULL,
  by = NULL,
  envir = parent.frame()
)

build_covobj(
  var,
  dist,
  args,
  upper = NULL,
  lower = NULL,
  by = NULL,
  envir = parent.frame()
)

Arguments

var: variable name, character.
dist: distribution function name.
args: character vector of arguments for dist.
lower: lower limits for var.
upper: upper limits for var.
by: grouping variable.
envir: environment for resolving symbols in expressions.

Value

A covobj object.

Details

When length of var is greater than one, both lower and upper must be named vectors when specification is made. However, it is acceptable to specify nothing or to use unnamed limits when the length of var is 1.

Examples


build_covform("WT", "rnorm", c("mu = 80", "sd = 40"), lower = 40, upper = 140)
#> Formula WT[40,140]~rnorm(mu = 80,sd = 40)
build_covform("WT", "rnorm", "80,40", lower = 40, upper = 140)
#> Formula WT[40,140]~rnorm(80,40)

build_covobj("WT", "rnorm", "80,40", lower = 40, upper = 140)
#> Formula <not-parsed>