relSim (version 1.0.0)

randomSib: Generate a random sibling from a given DNA profile and a given set of allele frequencies

Description

Generates a random sibling from a given DNA profile from a given set of allele frequencies. At each locus, the sibling inherits the first allele of the given profile with one quarter, or the second allele with probability one quarter, both alleles with probability one quarter, or neither with probability one quarter. If the sibling inherits zero or one identical alleles, the missing alleles are chosen at random with probability proportional to the allele frequencies.

Usage

randomSib(profile, Freqs)

Value

A vector with 2*nLoci elements. Each pair of elements represents the genotpe of the random individual at that locus. The genotype alleles are always ordered so that allele1 <= allele2.

Arguments

profile

A vector consisting of 2*nLoci elements. Each element in the vector is the (coded) allele held by the individual. This represents the sibling.

Freqs

A list containing two lists labelled loci and freqs. The second list is a list of vectors containing the allele frequencies of each allele at each locus in the multiplex.

Author

James M. Curran

Details

The alleles are simply integers rather than the STR repeat numbers. This speeds up computation immensely when calculating any of the LRs or IBS.

See Also

randomChild, randomSample

Examples

data(fbiCaucs)
P1 = randomProfile(fbiCaucs)
S1 = randomSib(P1,fbiCaucs)
P1
S1