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# Cosslett (1983) nonparametric binary response estimator
#eg2: F <- 1/2 \delta_{-1} + 1/2 \delta_{1} Two components
F <- function(x) 0 * (x <= -1) + 1/2 * (x >= -1) + 1/2 * (x >= 1)
n <- 5000
v <- rnorm(n)
eta <- sample(c(-1,1),n,replace=TRUE,prob = c(1/2,1/2))
y <- (eta < v)-0
fit <- Cosslett(x = v, y = y)
par(mfrow = c(1,2))
plot(fit$x,fit$y/sum(fit$y),type = "l", xlab = "x", ylab = "f(x)", main = "density")
plot(fit$x,cumsum(fit$y)/(sum(fit$y)),type = "l", xlab = "x",
ylab = "f(x)", main = "distribution F")
lines(fit$x,F(fit$x),col = 3)
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