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ESN.NOTRUNC = function(mu,Sigma,lambda,tau){
p = length(lambda)
if(p==1){
SL = lambda^2
mom1 = invmills(tau,0,sqrt(1+lambda^2))*lambda
EW = -tau*(1+SL)^-1*lambda
var = Sigma*(1 - mom1*(-EW + mom1))
return(list(mean = mu + sqrt(Sigma)*mom1,EYY = var + mom1^2,varcov = var))
}
SL = sum(lambda^2)
# eta = invmills(tau,0,sqrt(1+SL))
# delta = eta*lambda
#delta = invmills(tau,0,sqrt(1+SL))*lambda
mom1 = invmills(tau,0,sqrt(1+SL))*lambda
#second moment OK
EW = -tau*(1+SL)^-1*lambda
#mom2 = delta%*%t(EW) + diag(p)
var = diag(p) - mom1%*%t(-EW + mom1)
SS = sqrtm(Sigma)
mom1 = SS%*%mom1 + mu
var = SS%*%var%*%t(SS)
mom2 = var + mom1%*%t(mom1)
return(list(mean = mom1,EYY = mom2,varcov = var))
}
# ESN.NOTRUNC = function(mu,Sigma,lambda,tau){
# p = length(mu)
# if(p==1){
# s = sqrt(Sigma)
# tautil = tau/sqrt(1+sum(lambda^2))
# phi = lambda/sqrt(1+sum(lambda^2))
# eta = invmills(tau,0,sqrt(1+lambda^2))
# Gamma = Sigma/(1+lambda^2)
# mub = lambda*tau*Gamma/s
# F1 = mu + lambda*s*eta
# F2 = mu*F1 + Sigma + lambda*s*eta*(mu-mub)
# varY = F2 - F1^2
# return(list(mean = round(F1,4),EYY = round(F2,4), varcov = round(varY,4)))
# }
# SS = sqrtm(Sigma)
# iSS = solve(SS)
# #aux
# tautil = tau/sqrt(1+sum(lambda^2)) #ok #dif
# Phi = diag(p) + lambda%*%t(lambda) #ok #dif
# Gamma = SS%*%solve(Phi)%*%SS
# Gamma = (t(Gamma) + Gamma)/2
# iGamma = iSS%*%Phi%*%iSS
# varphi = iSS%*%lambda #ok
# mub = tau*Gamma%*%varphi
# eta = invmills(tau,0,sqrt(1+sum(lambda^2)))
# delta = eta*Sigma%*%varphi #ok
#
# #ESN part
# muY = mu + delta
# varY = matrix(NA,p,p)
# EXX = mu%*%t(muY) + delta%*%t(mu - mub) + Sigma
# EXX = (EXX + t(EXX))/2
# varY = EXX - muY%*%t(muY)
# return(list(mean = round(muY,4),EYY = round(EXX,4), varcov = round(varY,4)))
# }
#
#
# library(mvtnorm)
# meanvarESN.infs(mu,Sigma,lambda,tau)
#
# #MGF.noinfs(a = -10^6,b=10^6,mu,Sigma,lambda,tau)
#
# meanvarESN3(mu = mu,Sigma = Sigma,lambda = lambda,tau = tau)
#
# library(microbenchmark)
# library(ggplot2)
# compare <- microbenchmark(meanvarESN.infs(mu,Sigma,lambda,tau),
# meanvarESN3(mu = mu,Sigma = Sigma,lambda = lambda,tau = tau),
# times = 50)
# autoplot(compare)
#
#
# meanvarESN.infs(2,5,-1,2)
# meanvarESN3(mu = 2,Sigma = 5,lambda = -1,tau = 2)
#
# meanvarESNuni(a=0,mu = 2,Sigma = 5,lambda = -1,tau = 2)
#meanvarESNuni(a = NULL,b = NULL,mu = 2,Sigma = 5,lambda = -1,tau = 2)
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