pick_psa: Helper function to create a list with random draws or...

In WARDEN: Workflows for Health Technology Assessments in R using Discrete EveNts

Helper function to create a list with random draws or whenever a series of functions needs to be called. Can be implemented within pick_val_v.

Description

Helper function to create a list with random draws or whenever a series of functions needs to be called. Can be implemented within pick_val_v.

Usage

pick_psa(f, ...)

Arguments

f	A string or vector of strings with the function to be called, e.g., "rnorm"
...	parameters to be passed to the function (e.g., if "rnorm", arguments n, mean, sd)

Details

This function can be used to pick values for the PSA within pick_val_v.

The function will ignore NA items within the respective parameter (see example below). If an element in f is NA (e.g., a non PSA input) then it will return NA as its value This feature is convenient when mixing distributions with different number of arguments, e.g., rnorm and rgengamma.

While it's slightly lower than individually calling each function, it makes the code easier to read and more transparent

Value

List with length equal to f of parameters called

Examples

params <- list(
param=list("a","b"),
dist=list("rlnorm","rnorm"),
n=list(4,1),
a=list(c(1,2,3,4),1),
b=list(c(0.5,0.5,0.5,0.5),0.5),
dsa_min=list(c(1,2,3,4),2),
dsa_max=list(c(1,2,3,4),3)
)
pick_psa(params[["dist"]],params[["n"]],params[["a"]],params[["b"]])

#It works with functions that require different number of parameters
params <- list(
 param=list("a","b","c"),
 dist=list("rlnorm","rnorm","rgengamma"),
 n=list(4,1,1),
 a=list(c(1,2,3,4),1,0),
 b=list(c(0.5,0.5,0.5,0.5),0.5,1),
 c=list(NA,NA,0.2),
 dsa_min=list(c(1,2,3,4),2,1),
 dsa_max=list(c(1,2,3,4),3,3)
)

pick_psa(params[["dist"]],params[["n"]],params[["a"]],params[["b"]],params[["c"]])

#Can be combined with multiple type of functions and distributions if parameters are well located

params <- list(
param=list("a","b","c","d"),
dist=list("rlnorm","rnorm","rgengamma","draw_tte"),
n=list(4,1,1,1),
a=list(c(1,2,3,4),1,0,"norm"),
b=list(c(0.5,0.5,0.5,0.5),0.5,1,1),
c=list(NA,NA,0.2,0.5),
c=list(NA,NA,NA,NA), #NA arguments will be ignored
dsa_min=list(c(1,2,3,4),2,1,0),
dsa_max=list(c(1,2,3,4),3,3,2)
)

WARDEN documentation built on Aug. 8, 2025, 7:50 p.m.