Ancestry between all frame pairs

Every (coarser, finer) code pair that shares at least one atom, for all frame pairs.

scale_ancestry(x)

Arguments

x

A NestedScale.

Value

A data.frame with columns parent_frame, parent, child_frame, child.

Details

Computed atom-mediated, directly from the leaftable – deliberately not as a transitive closure of scale_family(). Closing a hierarchy that cross-cuts manufactures false relationships: in the example scale, group GB straddles both sectors, so closing sector -> class -> group -> unit would wrongly report sector P as an ancestor of unit U5, which lies in sector S.

For frames that do not nest this relation is overlap, not containment – test a given pair with scale_nests().

Frame columns are retained because codes are not unique across frames: in the example, "G1" exists at both class and group, so a bare (parent, child) pair would read as a self-loop.

Examples

head(scale_ancestry(scale_example()))
#>   parent_frame parent child_frame child
#> 1       sector      P       class    G1
#> 2       sector      P       class    G2
#> 3       sector      P       group    G1
#> 4       sector      P       group    GB
#> 5       sector      P        unit    U1
#> 6       sector      P        unit    U2