Nothing
# loglik defined above
data(geyser, package = "MASS")
snippet("faithful-mle01", echo = FALSE)
snippet("faithful-mle02", echo = FALSE)
m <- mean( ~ duration, data = geyser)
s <- sd( ~ duration, data = geyser)
ml.faithful <- maxLik(loglik.faithful, x = geyser$duration,
start = c(0.5, m - 1, m + 1, s, s))
mle <- coef(ml.faithful)
p <- function(a) {
ml.faithful.a <- maxLik(loglik.faithful, x = geyser$duration,
start = c(a, m - 1, m + 1, s, s),
fixed = 1)
lrt.stat <- 2 * (logLik(ml.faithful) - logLik(ml.faithful.a))
pval <- 1 - pchisq(lrt.stat, df = 1)
return(pval)
}
lo <- uniroot(function(a){p(a) - 0.05}, c(0.1, mle[1])) %>% value(); lo
hi <- uniroot(function(a){p(a) - 0.05}, c(0.9, mle[1])) %>% value(); hi
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