Nothing
# test outfun (function)
epsilon <- 1e-15
library(mcmc)
suppressWarnings(RNGkind("Marsaglia-Multicarry"))
set.seed(42)
n <- 100
rho <- 0.5
beta0 <- 0.25
beta1 <- 1
beta2 <- 0.5
x1 <- rnorm(n)
x2 <- rho * x1 + sqrt(1 - rho^2) * rnorm(n)
eta <- beta0 + beta1 * x1 + beta2 * x2
p <- 1 / (1 + exp(- eta))
y <- as.numeric(runif(n) < p)
out <- glm(y ~ x1 + x2, family = binomial())
logl <- function(beta) {
if (length(beta) != 3) stop("length(beta) != 3")
beta0 <- beta[1]
beta1 <- beta[2]
beta2 <- beta[3]
eta <- beta0 + beta1 * x1 + beta2 * x2
p <- exp(eta) / (1 + exp(eta))
return(sum(log(p[y == 1])) + sum(log(1 - p[y == 0])))
}
out.metro <- metrop(logl, coefficients(out), 1e3, scale = 0.01)
out.metro$accept
out.metro <- metrop(out.metro, scale = 0.1)
out.metro$accept
out.metro <- metrop(out.metro, scale = 0.5)
out.metro$accept
apply(out.metro$batch, 2, mean)
out.metro <- metrop(logl, as.numeric(coefficients(out)), 1e2,
scale = 0.5, debug = TRUE, outfun = function(x) c(x, x^2))
out.metro <- metrop(out.metro)
out.metro$outfun
dim(out.metro$batch)
logl <- function(beta, x1, x2, y) {
if (length(beta) != 3) stop("length(beta) != 3")
beta0 <- beta[1]
beta1 <- beta[2]
beta2 <- beta[3]
eta <- beta0 + beta1 * x1 + beta2 * x2
p <- exp(eta) / (1 + exp(eta))
return(sum(log(p[y == 1])) + sum(log(1 - p[y == 0])))
}
out.metro <- metrop(logl, as.numeric(coefficients(out)), 1e2,
scale = 0.5, debug = TRUE, x1 = x1, x2 = x2, y = y)
out.metro$lud
out.metro <- metrop(out.metro, x1 = x1, x2 = x2, y = y)
out.metro$lud
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