Define a lineage edge

A lineage edge states that to depends on from. Node identifiers use a simple convention:

Usage

lineage_edge(
  from,
  to,
  from_type = NULL,
  to_type = NULL,
  relationship = "derives",
  condition = NA_character_,
  label = NA_character_
)

Arguments

from, to

Character node identifiers. to depends on from.

from_type, to_type

Optional node types ("dataset", "variable", "analysis", "output"). Inferred when NULL.

relationship

Edge semantics. One of "derives", "groups_by", "filters", "summarises", "models", "reports", "transports" or a custom string.

condition

Optional condition restricting when the edge applies (for example "TRT01P == 'Drug A'"). Recorded for transparency; not evaluated.

label

Optional human-readable label.

Value

A tibble with one row and class td_edge.

Details

• a dataset is written as "ADSL";

• a dataset variable is written as "ADSL.TRT01P";

• an analysis is written as "MMRM";

• an output (TLF) is written as "Table_14_2_1".