Nothing
enparCensored.bootstrap.ci <-
function (x, censored, censoring.side, correct.se, left.censored.min,
right.censored.max, est.fcn, ci.type, conf.level, n.bootstraps,
obs.mean, obs.se.mean)
{
N <- length(x)
boot.vec.mean <- numeric(n.bootstraps)
boot.vec.t <- numeric(n.bootstraps)
too.few.obs.count <- 0
no.cen.obs.count <- 0
x.no.cen <- x[!censored]
for (i in 1:n.bootstraps) {
index <- sample(N, replace = TRUE)
new.x <- x[index]
new.censored <- censored[index]
new.n.cen <- sum(new.censored)
if ((N - new.n.cen) < 2) {
too.few.obs.count <- too.few.obs.count + 1
i <- i - 1
next
}
if (new.n.cen == 0) {
mu.hat <- mean(new.x)
boot.vec.mean[i] <- mu.hat
boot.vec.t[i] <- sqrt(N) * (mu.hat - obs.mean)/sd(new.x)
no.cen.obs.count <- no.cen.obs.count + 1
}
else {
params <- do.call(est.fcn, list(x = new.x, censored = new.censored,
censoring.side = censoring.side, correct.se = correct.se,
left.censored.min = left.censored.min, right.censored.max = right.censored.max,
ci = FALSE))$parameters
mu.hat <- params["mean"]
boot.vec.mean[i] <- mu.hat
boot.vec.t[i] <- (mu.hat - obs.mean)/params["se.mean"]
}
}
alpha <- 1 - conf.level
if (ci.type == "two-sided")
alpha <- alpha/2
ci.limits.pct <- switch(ci.type, `two-sided` = quantile(boot.vec.mean,
probs = c(alpha, 1 - alpha)), lower = c(quantile(boot.vec.mean,
probs = alpha), Inf), upper = c(0, quantile(boot.vec.mean,
probs = conf.level)))
compute.bca <- length(unique(x.no.cen)) >= 3
if (compute.bca) {
za <- qnorm(alpha)
z0 <- qnorm(sum(boot.vec.mean <= obs.mean)/n.bootstraps)
jack.vec <- enparCensored.jackknife(x = x, censored = censored,
censoring.side = censoring.side, correct.se = correct.se,
left.censored.min = left.censored.min, right.censored.max = right.censored.max,
est.fcn = est.fcn)
num <- sum(as.vector(scale(jack.vec, scale = FALSE))^3)
denom <- 6 * (((length(jack.vec) - 1) * var(jack.vec))^(3/2))
a <- num/denom
ci.limits.bca <- switch(ci.type, `two-sided` = {
alpha1 <- pnorm(z0 + (z0 + za)/(1 - a * (z0 + za)))
alpha2 <- pnorm(z0 + (z0 - za)/(1 - a * (z0 - za)))
quantile(boot.vec.mean, probs = c(alpha1, alpha2))
}, lower = {
alpha1 <- pnorm(z0 + (z0 + za)/(1 - a * (z0 + za)))
c(quantile(boot.vec.mean, probs = alpha1), Inf)
}, upper = {
alpha2 <- pnorm(z0 + (z0 - za)/(1 - a * (z0 - za)))
c(0, quantile(boot.vec.mean, probs = alpha2))
})
}
else ci.limits.bca <- switch(ci.type, `two-sided` = c(NA,
NA), lower = c(NA, Inf), upper = c(0, NA))
ci.limits.t <- switch(ci.type, `two-sided` = {
t.quantiles <- quantile(boot.vec.t, probs = c(1 - alpha,
alpha))
c(obs.mean - t.quantiles[1] * obs.se.mean, obs.mean -
t.quantiles[2] * obs.se.mean)
}, lower = {
t.quantiles <- quantile(boot.vec.t, probs = 1 - alpha)
c(obs.mean - t.quantiles * obs.se.mean, Inf)
}, upper = {
t.quantiles <- quantile(boot.vec.t, probs = alpha)
c(0, obs.mean - t.quantiles * obs.se.mean)
})
ci.limits <- c(ci.limits.pct, ci.limits.bca, ci.limits.t)
names(ci.limits) <- c("Pct.LCL", "Pct.UCL", "BCa.LCL", "BCa.UCL",
"t.LCL", "t.UCL")
ret.obj <- list(name = "Confidence", parameter = "mean",
limits = ci.limits, type = ci.type, method = "Bootstrap",
conf.level = conf.level, sample.size = N, n.bootstraps = n.bootstraps,
too.few.obs.count = too.few.obs.count, no.cen.obs.count = no.cen.obs.count)
oldClass(ret.obj) <- "intervalEstimateCensored"
ret.obj
}
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