Tests: Evaluation of a condition on SNPS or individuals in a...

In gaston: Genetic Data Handling (QC, GRM, LD, PCA) & Linear Mixed Models

Evaluation of a condition on SNPS or individuals in a bed.matrix

Description

Evaluate a condition and return logical vector or indices

Usage

 test.snps(x, condition, na.to.false = TRUE) 
        test.inds(x, condition, na.to.false = TRUE) 
        which.snps(x, condition) 
        which.inds(x, condition) 

Arguments

x	A bed.matrix
condition	Condition used to select SNPs
na.to.false	If TRUE, NAs are replaced by FALSE

Details

The conditions can involve global variables and all variables defined in the data frame x@snps, in particular for test.snps and which.snps

• chr, id, dist, pos, A1, A2

• If basic stats have been computed (see set.stats), N0, N1, N2, NAs, callrate, maf, hz, etc.

• If Hardy-Weinberg Equilibrium test has been performed (see set.hwe), hwe.

and for test.inds and which.inds

• famid, id, father, mother, sex, pheno

• If basic stats have been computed (see set.stats), N0, N1, N2, NAs, callrate, etc.

Value

test.snps and test.inds return a logical vector of length ncol(x) and nrow(x) respectively. which.snps(x, condition) is equivalent to which(test.snps(x, condition)) and which.inds(x, condition) to which(test.inds(x, condition)).

See Also

select.snps, select.inds, set.stats, set.hwe

Examples

# Load data
data(LCT)
x <- as.bed.matrix(LCT.gen, LCT.fam, LCT.bim)

# SNPs and individuals with a callrate < 100%
w <- test.snps(x, callrate < 1)
table(w)
which.snps(x, callrate < 1)
which.inds(x, callrate < 1)

gaston documentation built on May 29, 2024, 7:33 a.m.