Varying a data-generation parameter during SBC

[mike-lawrence]

Say my generate_data() function takes an argument N specifying the number of data points to generate. Is there a way to specify a tar_stan_mcmc_rep_summary target that iterates over a list of values for N?

[wlandau]

If I understand correctly, you want to generate multiple datasets with different values of N and have tar_stan_mcmc_rep_summary() output for both, right? I believe you can accomplish this with static branching via tarchetypes::tar_map(). Sketch:

# _targets.R
library(targets)
library(tarchetypes)
library(stantargets)
list(
  tar_map(
    values = list(N = c(100, 500, 1000),
    tar_stan_mcmc_rep_summary(x, data = generate_data(N = N), ...)
  )
)

[mike-lawrence]

That's precisely it, thanks!