lme4 (version 0.99875-9)

pedigree-class: Class "pedigree"

Description

Objects of class "pedigree" represent a set of individuals that can have two parents including their parent-child relations. The terminology has been taken from cattle breeding.

Objects from the Class

Objects can be created by calls of the form new("pedigree", ...), or more conveniently, pedigree(sire= ., dam = ., label = .).

References

R. A. Mrode, Linear Models for the Prediction of Animal Breeding Values, 2nd ed, CABI Publishing, 2005.

See Also

pedigree

Examples

## Rather use, pedigree()!   The following is "raw code":
## Example from chapter 2 of Mrode (2005)
p1 <- new("pedigree",
          sire = as.integer(c(NA,NA,1, 1,4,5)),
          dam  = as.integer(c(NA,NA,2,NA,3,2)),
          label = as.character(1:6))
p1
(dtc <- as(p1, "dtCMatrix"))   # T-inverse in Mrode's notation
solve(dtc)
chol(p1)  # (left) Cholesky factor of A, the relationship matrix