refund (version 0.1-23)

Xt_siginv_X: Internal computation function

Description

Internal function used compute the products `(X otimes Theta)^t (I otimes Sigma^-1) (X otimes Theta)` and `(X otimes Theta)^t (I otimes Sigma^-1) (y)` in cross-sectional VB algorithm and Gibbs sampler

Usage

Xt_siginv_X(tx, siginv, y = NULL)

Arguments

tx

transpose of the X design matrix

siginv

inverse variance matrix

y

outcome matrix. if NULL, function computes first product; if not, function computes second product.