ElstonStewart-package {ElstonStewart} | R Documentation |

## Elston-Stewart package

### Description

A flexible implementation of the Elston-Stewart algorithm

### Details

The Elston-Stewart algorithm allows to compute probability functions in pedigrees.

The function `es.pedigree`

allows to create S3 objects for pedigrees. They can be
plotted with a S3 method `plot.es.pedigree`

which is simply a wrapper for the
method provided in `kinship2`

.

The algorithm itself is run by two functions, `Elston`

and `Likelihood`

.
`Elston`

computes a probability for a single pedigree, given a probability model (similar
to the one given in `modele.di`

). It relies on memoization (or dynamic programming)
and allows vectorization (computing a vector of probabilities at once). `Likelihood`

is similar, but runs on pedigrees lists: it computes (the sum of) the logarithms of the probabilities
for each pedigree. It allows parallelization, running the computation for the various
pedigrees on different nodes of a cluster. The cluster is left opened for being re-used
(with memoization) on the same set of pedigrees. It can be closed with `es.stopCluster`

.

Two small data sets are provided for illustration, `conrad2`

and `fams`

.
The Elston-Stewart vignette gives commented examples.

### Author(s)

Herve Perdry herve.perdry@u-psud.fr

[Package

*ElstonStewart* version 1.1

Index]