Build a object or formula to use with covset.

Source: R/build.R

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

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

Details

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