Turn a pedigree into a graph

Turn a pedigree into a graph

Usage

ped2graph(
  ped,
  personID = "ID",
  momID = "momID",
  dadID = "dadID",
  directed = TRUE,
  adjacent = c("parents", "mothers", "fathers")
)

Arguments

ped

a pedigree dataset. Needs ID, momID, and dadID columns

personID

character. Name of the column in ped for the person ID variable

momID

character. Name of the column in ped for the mother ID variable

dadID

character. Name of the column in ped for the father ID variable

directed

Logical scalar. Default is TRUE. Indicates whether or not to create a directed graph.

adjacent

Character. Relationship that defines adjacency in the graph: parents, mothers, or fathers

Value

A graph

Details

The general idea of this function is to represent a pedigree as a graph using the igraph package.

Once in graph form, several common pedigree tasks become much simpler.

The adjacent argument allows for different kinds of graph structures. When using parents for adjacency, the graph shows all parent-child relationships. When using mother for adjacency, the graph only shows mother-child relationships. Similarly when using father for adjacency, only father-child relationships appear in the graph. Construct extended families from the parent graph, maternal lines from the mothers graph, and paternal lines from the fathers graph.