#' β <- matrix(c(1,-2,3,1),ncol=2)
#' mr <- multiRun(...) #see bootstrap example in ?multiRun : return lists of mu_hat
#' μ <- normalize(β)
#' β <- matrix(c(1,-2,3,1),ncol=2)
#' mr <- multiRun(...) #see bootstrap example in ?multiRun : return lists of mu_hat
#' μ <- normalize(β)