Estimate allele effects matrix, B hat, with Rcpp functions

Source: R/rcpp_calc_Bhat.R

Estimate allele effects matrix, B hat, with Rcpp functions

rcpp_calc_Bhat2(X, Y, Sigma_inv)

Arguments

X

dn by df block-diagonal design matrix that incorporates genetic info for two markers. Note that we can use the same marker data twice.
Y

dn by 1 matrix, ie, a column vector, of d phenotypes' measurements
Sigma_inv

dn by dn inverse covariance matrix, often composed as inverse of \(K \otimes V_g + I_n \otimes V_g\)

Value

a df by 1 matrix of GLS-estimated allele effects

Examples

X1 <- as.matrix(rbinom(n = 100, size = 1, prob = 1 / 2))
X <- gemma2::stagger_mats(X1, X1)
Sigma_inv <- diag(200)
Y <- runif(200)
rcpp_calc_Bhat2(X = X, Y = Y, Sigma_inv = Sigma_inv)

#>           [,1]
#> [1,] 0.4113715
#> [2,] 0.4518089