Extract raw variable dependencies from derived variable metadata

For a given derived variable, extract the list of raw variables it depends on by parsing the DerivedVar::... pattern in variable_details.

Usage

get_raw_var_dependencies(derived_var, variable_details)

Arguments

derived_var

character. Name of the derived variable

variable_details

data.frame. Detail-level metadata with columns: variable, recStart

Value

Character vector of raw variable names that the derived variable depends on. Returns character(0) if no dependencies found.

Details

Parses patterns like:

• DerivedVar::[HWTGHTM, HWTGWTK] → c("HWTGHTM", "HWTGWTK")

• DerivedVar::[ADL_01, ADL_02, ADL_03, ADL_04, ADL_05] → c("ADL_01", ...)

See also

Other helpers: identify_derived_vars()

Examples

if (FALSE) { # \dontrun{
variable_details <- data.frame(
  variable = c("HWTGBMI_der"),
  recStart = c("DerivedVar::[HWTGHTM, HWTGWTK]"),
  stringsAsFactors = FALSE
)

get_raw_var_dependencies("HWTGBMI_der", variable_details)
# Returns: c("HWTGHTM", "HWTGWTK")
} # }