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Insert Back Transformations of Model Parameters

Source: R/tmb_model_editors.R
mp_tmb_insert_backtrans.Rd

Insert Back Transformations of Model Parameters

Usage

mp_tmb_insert_backtrans(
  model,
  variables = character(),
  transformation = mp_log
)

mp_tmb_implicit_backtrans(model, variables = character())

Arguments

model

TMB model spec object produced using mp_tmb_library or mp_tmb_model_spec.

variables

Character vector of parameters to back transform.

transformation

A transformation object such as mp_log, which is the default. See the help page for mp_log for available options.

Value

A new model specification object with expressions for the untransformed (or back transformed) parameters at the beginning of the before phase. The transformed version of the parameter is also added to the defaults and are identified with a prefixed name (e.g., log_beta if beta is log transformed).

Functions

  • mp_tmb_implicit_backtrans(): Insert parameter transformations implicitly by pre-pending the name of the transformations in front of the names of the variables that you ask for (e.g., "log_case_reports") even if this variable is not in the model as long as the base name (e.g., "case_reports") is.

See also

mp_tmb_insert_trans()

Examples

init_si = ("starter_models"
  |> mp_tmb_library("si", package = "macpan2")
  |> mp_tmb_insert_backtrans("beta", mp_log)
  |> mp_initial_list()
)
print(init_si$log_beta)
#>           [,1]
#> [1,] -1.609438
print(log(init_si$beta))
#>           [,1]
#> [1,] -1.609438