Nothing
fscores.r <-
function (betas, X, method) {
logf.z <- function (z, y, betas) {
pr <- probs(c(betas %*% c(1, z)))
if (prior)
-sum(dbinom(y, 1, pr, log = TRUE), na.rm = TRUE) - dnorm(z, log = TRUE)
else
-sum(dbinom(y, 1, pr, log = TRUE), na.rm = TRUE)
}
fscore <- function (logf.z, y, betas) {
opt <- optim(0, fn = logf.z, method = "BFGS", hessian = TRUE, y = y, betas = betas)
hc <- c(1/opt$hes)
list(mu = opt$par, hes = hc)
}
if (method == "EB") {
scores.ML <- hes.ML <- numeric(nx)
for (i in 1:nx) {
out <- fscore(logf.z = logf.z, y = X[i, ], betas = betas)
scores.ML[i] <- out$mu
hes.ML[i] <- out$hes
}
res$z1 <- scores.ML
res$se.z1 <- sqrt(hes.ML)
}
if (method == "EAP") {
Z <- object$GH$Z
GHw <- object$GH$GHw
pr <- probs(Z %*% t(betas))
mX <- 1 - X
if (any(na.ind <- is.na(X)))
X[na.ind] <- mX[na.ind] <- 0
p.xz <- exp(X %*% t(log(pr)) + mX %*% t(log(1 - pr)))
p.x <- c(p.xz %*% GHw)
p.zx <- p.xz / p.x
res$z1 <- c(p.zx %*% (Z[, 2] * GHw))
res$se.z1 <- sqrt(c(p.zx %*% (Z[, 2] * Z[, 2] * GHw)) - res$z1^2)
}
if (method == "MI") {
constraint <- object$constraint
betas <- c(betas[, 1], betas[1, 2])
if (!is.null(constraint))
betas <- betas[-constraint[, 1]]
Var.betas <- vcov(object, robust.se)
scores.B <- hes.B <- array(0, dim = c(nx, B))
for (b in 1:B) {
betas. <- mvrnorm(1, betas, Var.betas)
betas. <- betas.rasch(betas., constraint, p)
for (i in 1:nx) {
out <- fscore(logf.z = logf.z, y = X[i, ], betas = betas.)
scores.B[i, b] <- out$mu
hes.B[i, b] <- out$hes
}
}
scores.av <- rowMeans(scores.B)
hes.av <- rowMeans(hes.B)
SV <- array(0, dim = c(nx, B))
for (b in 1:B) {
for (i in 1:nx) {
sc.dif <- scores.B[i, b] - scores.av[i]
SV[i, b] <- outer(sc.dif, sc.dif)
}
}
SV <- rowSums(SV)/(B - 1)
hes.av <- hes.av + (1 + 1/B) * SV
res$z1 <- scores.av
res$se.z1 <- sqrt(hes.av)
attr(res, "zvalues.MI") <- scores.B
attr(res, "var.zvalues.MI") <- hes.B
}
res
}
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