Prevalence by arbitrary age groups

Usage

ageprev_lf(
  mod,
  a_idx = NULL,
  s_idx = NULL,
  y_idx = NULL,
  ag_span = 5,
  expand = FALSE,
  version = "C"
)

sidx: sex (1 = Male, 2 = Female, 0 = Both) Notes: Assumes that AGE_START is 15 and single year of age.