quickEst {ASMap} | R Documentation |

## Very quick estimation of genetic map distances.

### Description

Very quick estimation of genetic map distances for a constructed R/qtl object

### Usage

```
quickEst(object, chr, map.function = "kosambi", ...)
```

### Arguments

`object` |
An R/qtl |

`chr` |
A character string of linkage group names that require (re)estimation of their genetic map distances. |

`map.function` |
Character string of either |

`...` |
Other arguments passed to |

### Details

For linkage groups with large numbers of markers, the Hidden Markov algorithm in `est.map`

can be extremely slow. The computational burden for this algorithm
increases as the number of missing values and genotyping errors
increase. `quickEst`

circumvents this by using the Viterbi
algorithm computationally implemented in `argmax.geno`

of the
qtl package. Initial conservative estimates of the map distances
are calculated from inverting recombination fractions outputted from
`est.rf`

. These are then passed to `argmax.geno`

and
imputation of missing allele scores is performed along with
re-estimation of map distances.

### Value

The cross object is returned with identical class structure as the inputted cross object.

### Author(s)

Julian Taylor

### References

Taylor, J., Butler, D. (2017) R Package ASMap: Efficient Genetic
Linkage Map Construction and Diagnosis. Journal of Statistical Software,
**79**(6), 1–29.

### See Also

### Examples

```
data(mapDH, package = "ASMap")
mapDH1 <- quickEst(mapDH, map.function = "kosambi")
```

*ASMap*version 1.0-7 Index]