Additive Relationship Matrix

Inverse of the Relationship matrix from a pedigree

1 | ```
getAInv(ped)
``` |

`ped` |
a pedigree that includes the individuals who occur in |

Determine the inverse of the relationship matrix from a pedigree
`ped`

.

sparse matrix, inverse of the relationship matrix

2010. A.I. Vazquez, D.M. Bates, G.J.M. Rosa, D. Gianola and K.A. Weigel. Technical Note: An R package for fitting generalized linear mixed models in animal breeding. Journal of Animal Science, 88:497-504.

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