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#-------------------------------------------------------------------------------#
# Package: Network-Based Genome-Wide Association Studies #
# Author: Pariya Behrouzi #
# Emails: <pariya.Behrouzi@gmail.com> #
# Date: Nov 21th 2017 #
#-------------------------------------------------------------------------------#
Gibbs_method = function(y, rho = NULL, n_rho = NULL, rho_ratio = NULL, Theta=NULL, ncores = 4, chain = 1, max.elongation = 10, em.tol=0.001)
{
p <- ncol(y)
n <- nrow(y)
lower.upper = lower.upper(y)
if(is.null(rho))
{
if(is.null(n_rho)) n_rho = 10
cr = cor(y, method="spearman") - diag(p)
cr[is.na(cr)] <- 0
rho_max = max(max(cr),-min(cr))
if(rho_max == 0)
{
ty <- npn(y, npn.func= "shrinkage")
cr = cor(ty, method="spearman") - diag(p)
rho_max = max(max(cr),-min(cr))
}
if(rho_max >= .7) rho_max = .7
rho_min = rho_ratio * rho_max
rho = exp(seq(log(rho_max), log(rho_min), length = n_rho))
rm(cr, rho_max, rho_min, rho_ratio)
}
Gibbs.method <- calculate_EM_Gibbs(chain, y, rho = rho[chain], Theta=Theta, lower.upper = lower.upper, em.tol = em.tol, em.iter = max.elongation, gibbs.iter = 500, mc.iter = 1000, ncores = ncores)
invisible(return(Gibbs.method))
}
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