Create a trend specification for model parameters

Usage

make_trend(
  par_names,
  cov_names = NULL,
  kernels,
  bases = NULL,
  shared = NULL,
  trend_pnames = NULL,
  phase = "premap",
  par_input = NULL,
  at = NULL,
  custom_trend = NULL
)

Arguments

par_names: Character vector specifying which parameters to apply trend to
cov_names: Character vector specifying which covariates to use for each trend
kernels: Character vector specifying which kernel function to use for each trend
bases: Optional character vector specifying which base function to use for each trend
shared: Named list with entries the parameter names to be shared and the names the new names of the shared parameter.
trend_pnames: Optional character vector specifying custom parameter names
phase: Character vector (length 1 or length(par_names)) specifying the phase for each trend entry; one of "premap", "pretransform", or "posttransform". Defaults to "premap".
par_input: Optional character vector(s) of parameter names to use as additional inputs for the trend
at: If NULL (default), trend is applied everywhere. If a factor name (e.g., "lR"), trend is applied only to entries corresponding to the first level of that factor.
custom_trend: A trend registered with register_trend

Value

A list containing the trend specifications for each parameter

Examples

# Put trend on B and v parameters
trend <- make_trend(
  par_names = c("B", "v"),
  cov_names = "strial",
  kernels = c("exp_incr", "poly3"),
  phase = "premap",
  shared = list(shrd = list("B.B0", "v.d1"))
)
get_trend_pnames(trend)
#> [1] "B.w"    "B.d_ei" "v.d2"   "v.d3"   "shrd"