Co-variance matrix for dream() fit

Define generic vcov() for result of lmFit() and dream()

Usage

# S4 method for class 'MArrayLM'
vcov(object, vobj, coef)

Arguments

object

MArrayLM object return by lmFit() or dream()

vobj

EList object returned by voom()

coef

name of coefficient to be extracted

Value

variance-covariance matrix