acount: Find Approximate Number of Genotype Tables
In HWxtest: Exact Tests for Hardy-Weinberg Proportions

Description Usage Arguments Value References See Also Examples

Use acount to obtain the approximate number of genotype tables for a given set of allele counts. This method uses a normal approximation and is much faster than enumerating the tables with xcount but not as accurate.

acount(m)

`m`	vector containing the numbers of alleles of each type. Length must be at least 2. All items are positive integers. It can also be a matrix of genotype counts, an object of type `genotype`, but not a vector of genotype counts.

The approximate number of tables.

The methods are described by Engels, 2009. Genetics 183:1431.

hwx.test, xcount

# Allele counts from human Rh locus. Guo and Thompson, 1992, Figure 1
#
alleles <- c(15, 14, 11, 12, 2, 2, 1, 3)
acount(alleles)
# This approximation may be compared with the exact value of 250552020
#
ld <- c(6329, 319, 47, 2773, 75, 6702, 14, 2, 333)
acount(ld)
#
# This is an example where the number of tables is too large for a full enumeration.