makefamid {kinship}R Documentation

Identify family groups

Description

Given a set of parentage relationships, this subdivides a set of subjects into families.

Usage

makefamid(id, father.id, mother.id)

Arguments

id a vector of unique subject identifiers
father.id for each subject, the identifier of their biolgical father
mother.id for each subject, the identifier of thier biological mother

Details

This function may be useful to create a family identifier if none exists in the data (rare), to check for anomalies in a given family identifier (see the familycheck function), or to create a more space and time efficient kinship matrix by separating out marry-ins without children as 'unrelated'.

Value

a vector of family identifiers. Individuals who are not blood relatives of anyone else in the data set as assigned a family id of 0.

See Also

makefamid, kinship, makekinship

Examples

## Not run: 
> newid <- makefamid(cdata$gid, cdata$dadid, cdata$momid)
> table(newid==0)
 FALSE TRUE 
 17859 8191
# So nearly 1/3 of the individuals are not blood relatives.

> kin1 <- makekinship(cdata$famid, cdata$gid, cdata$dadid, cdata$momid)
> kin2 <- makekinship(newid, cdata$gid, cdata$dadid, cdata$momid, unique=0)
> dim(kin2)
[1] 26050 26050
> dim(kin1)
[1] 26050 26050

> length(kin2@blocks)/length(kin1@blocks)
[1] 0.542462
# Basing kin1 on newid rather than cdata$famid (where marry-ins were each
#   labeled as members of one of the 426 families) reduced its size by just
#   less than half.
## End(Not run)

[Package kinship version 1.1.0-21 Index]