Nothing
p2.est <-
function(x, y, n, j, k)
{
xa <- x[1:j]
ya <- y[1:j]
jp1 <- j + 1
xb <- x[jp1:k]
xb2 <- x[jp1:k]^2
yb <- y[jp1:k]
kp1 <- k + 1
xc <- x[kp1:n]
yc <- y[kp1:n]
g1 <- lm(ya ~ xa)
g2 <- lm(yb ~ xb + xb2)
g3 <- lm(yc ~ xc)
beta<-c(g1$coef[1],g1$coef[2],g2$coef[1],g2$coef[2],g2$coef[3],g3$coef[1],g3$coef[2])
s2 <- (sum((ya - g1$fit)^2) + sum((yc - g3$fit)^2))/(n - k + j)
t2 <- sum((yb - g2$fit)^2)/(k - j)
xj <- x[j]
xk <- x[k]
list(a0=beta[1],a1=beta[2],b0=beta[3],b1=beta[4],b2=beta[5],c0=beta[6],c1=beta[7], sigma2 =
s2, tau2 = t2, xj = xj, xk = xk)
}
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