R: Descriptive sample size and percentage

Table.N.Per {SNPassoc}

R Documentation

Descriptive sample size and percentage

Description

This function computes sample size and percentage for each category of a categorical trait (e.g. case-control status) for each genotype (or combination of genotypes).

Usage

Table.N.Per(var, dep, subset = !is.na(var))

Arguments

`var`	categorical trait.
`dep`	variable with genotypes or any combination of them
`subset`	an optional vector specifying a subset of observations to be used in the descriptive analysis.

Value

`tp`	A matrix giving sample size (n),and the percentage ( for each genotype

Examples

data(SNPs)
#sample size and percentage of cases and controls for each genotype 
#  Table.N.Per(SNPs$snp10001,SNPs$casco)

# The same table for a subset (males)
#  Table.N.Per(SNPs$snp10001,SNPs$casco,SNPs$sex=="Male")

# The same table assuming a dominant model
#  Table.N.Per(dominant(snp(SNPs$snp10001,sep="")),SNPs$casco,SNPs$sex=="Male")