Add inter-individual variability to a parameter

Defines a model string for a parameter, optionally adding inter-individual variability.

Usage

add_variability(param_name, eta_flag, param_table, param.type = 1)

Arguments

param_name

Character. The name of the parameter.

eta_flag

Integer. If 1, inter-individual variability is added; otherwise, it is not.

param_table

Data frame. A table containing parameter details with columns Name, init, and optionally bounds like lb and ub.

param.type

Integer. Transformation type: 1=Exponential, 2=Logistic. Defaults to 1.

Value

A list containing:

mod

Character. The model string for the parameter.

eta_init

Character. The initialization string for the variability parameter (if applicable).

Author

Zhonghui Huang

Examples

param_table <- initialize_param_table()
add_variability("cl", 1, param_table)
#> $mod
#> [1] "cl = exp(lcl+eta.cl)"
#> 
#> $eta_init
#> [1] "eta.cl ~ 0.1"
#>