format_mvmr: format_mvmr

In WSpiller/MRPracticals: An R Package illustrating features of MR Base and RadialMR

Description

Reads in summary data. Checks and organises columns for use in calculating multivariable Mendelian Randomization analyses. Where variant IDs are not provided, a vector is generated for variant identification.

Usage

format_mvmr(BXGs, BYG, seBXGs, seBYG, RSID)

Arguments

BXGs	A matrix containing beta-coefficient values for genetic associations with the each exposure. Columns should indicate exposure number, with rows representing estimates for a given genetic variant.
BYG	A numeric vector of beta-coefficient values for genetic associations with the outcome.
seBXGs	A matrix containing standard errors corresponding to the matrix of beta-coefficients BXGs.
seBYG	A numeric vector of standard errors corresponding to the beta-coefficients BYG.
RSID	A vector of names for genetic variants included in the analysis. If variant IDs are not provided (RSID="NULL"), a vector of ID numbers will be generated.

Value

A formatted data frame.

Author(s)

Wes Spiller; Eleanor Sanderson; Jack Bowden.

References

Sanderson, E., et al., An examination of multivariable Mendelian randomization in the single-sample and two-sample summary data settings. International Journal of Epidemiology, 2018. [Internet]. 2018;dyy262. Available from: https://dx.doi.org/10.1093/ije/dyy262

Examples

format_mvmr(summarydata[,c(1,2)],summarydata[,5],summarydata[,c(3,4)],summarydata[,6])

WSpiller/MRPracticals documentation built on April 25, 2020, 10:52 a.m.