checkdata {GLIDE}

A function used to check the core inputs of function glide

Description

It is used to check the core inputs of function glide

Usage

checkdata(formula,exposure_coeff,genotype_columns,data)

Arguments

formula

A an object of class "formula": outcome ~ adjusting covariates.

exposure_coeff

A named mumeric vector or a one-column dataframe for the external coefficients for genotype-exposure associations.

genotype_columns

An integer vector, column indices of data in which genotype data are stored.

data

A data frame composed of formula-related components and snp genotype columns.

Value

No return value, would generate error messages if input data are not right.

Author(s)

James Y. Dai and X. Wang

Examples

#load an example data; it includes a dataframe "simdat" and a one-column dataframe  "coeff"
data(simdata)
simdat=simdata$simdat
coeff=simdata$coeff
formula=as.formula("outcome~age+sex+pc1+pc2+pc3")
genotype_columns=which(grepl("^SNP",colnames(simdat)))
checkdata(formula=formula,exposure_coeff=coeff,genotype_columns,data=simdat)