# Creates a vector of chi-squared values from the allelic test of association

### Description

One degree of freedom Chi-squared test of allelic counts

### Usage

1 | ```
chi2(Xa, Y)
``` |

### Arguments

`Xa` |
A matrix of genotype values coded as 0, 1 or 2 for homozygous major, heterozygous, or homozygous minor, respectively. Rows are subjects and columns are SNPs. May be created with method as.double.snp.data from the GenABEL package. |

`Y` |
A vector of disease phenotypes, diseased = 1, non-diseased = 0 |

### Value

This function returns a vector of chi-squared, one degree of freedom, statistics for the allelic test of association. The length of this vector is the number of SNPs.

### Author(s)

Samuel G. Younkin

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