Nothing
# Linear C-LL
# Common variance for both segments
con.search.LL.C <- function(x, y, n, jlo, jhi)
{
fjk <- matrix(0, n)
fxy <- matrix(0, jhi - jlo + 1)
jkgrid <- expand.grid(jlo:jhi)
res <- data.frame(j = jkgrid,
k.ll = apply(jkgrid, 1, con.parmsFUN.LL.C, x = x,
y = y, n = n))
fxy <- matrix(res$k.ll, nrow = jhi-jlo+1)
rownames(fxy) <- jlo:jhi
z <- findmax(fxy)
jcrit <- z$imax + jlo - 1
list(jhat = jcrit, value = max(fxy))
}
con.parmsFUN.LL.C <- function(j, x, y, n){
a <- con.parms.LL.C(x,y,n,j,1)
nr <- nrow(a$theta)
est <- a$theta[nr, ]
b<-con.est.LL.C(x[j],est)
s2<-1/b$eta1
return(p.ll.C(n, j, s2))
}
con.parms.LL.C <- function(x,y,n,j0,e10){
th <- matrix(0,100,4)
# Iteration 0
th[1,1] <- e10
bc <- beta.calc.LL.C(x,y,n,j0,e10)
th[1,2:4] <- bc$B
# Iterate to convergence (100 Iter max)
for (iter in 2:100){
m <- iter-1
ec <- eta.calc.LL.C(x,y,n,j0,th[m,2:4])
th[iter,1] <- ec$eta1
bc <- beta.calc.LL.C(x,y,n,j0,ec$eta1)
th[iter,2:4] <- bc$B
theta <- th[1:iter,]
#delta <- abs(th[iter,]-th[m,])
delta <- abs(th[iter,]-th[m,])/th[m,]
if( (delta[1]<.001) & (delta[2]<.001) & (delta[3]<.001)
& (delta[4]<.001) )
break
}
list(theta=theta)
}
con.est.LL.C <- function(xj, est)
{
eta1 <- est[1]
a0 <- est[2]
a1 <- est[3]
b1 <- est[4]
b0 <- a0 + (a1 - b1) * xj
list(eta1 = eta1, a0 = a0, a1 = a1, b0 = b0, b1 = b1)
}
con.vals.LL.C <- function(x, y, n, j)
{
a <- con.parms.LL.C(x, y, n, j, 1)
nr <- nrow(a$theta)
est <- a$theta[nr, ]
b <- con.est.LL.C(x[j], est)
eta <- c(b$eta1)
beta <- c(b$a0, b$a1, b$b0, b$b1)
tau <- x[j]
list(eta = eta, beta = beta, tau = tau)
}
p.ll.C <- function(n, j, s2){
q1 <- n * log(sqrt(2 * pi))
q2 <- 0.5 * (n) * (1 + log(s2))
- (q1 + q2)
}
findmax <-function(a){
maxa<-max(a)
imax<- which(a==max(a),arr.ind=TRUE)[1]
jmax<-which(a==max(a),arr.ind=TRUE)[2]
list(imax = imax, jmax = jmax, value = maxa)
}
beta.calc.LL.C <- function(x, y, n, j, e1)
{
aa <- wmat.LL.C(x, y, n, j, e1)
W <- aa$w
bb <- rvec.LL.C(x, y, n, j, e1)
R <- bb$r
beta <- solve(W, R)
list(B = beta)
}
eta.calc.LL.C <- function(x, y, n, j, theta)
{
jp1 <- j + 1
a0 <- theta[1]
a1 <- theta[2]
b1 <- theta[3]
b0 <- a0 + (a1 - b1) * x[j]
rss1 <- sum((y[1:j] - a0 - a1 * x[1:j])^2)
rss2 <- sum((y[jp1:n] - b0 - b1 * x[jp1:n])^2)
e1 <- (n)/(rss1 + rss2)
list(eta1 = e1)
}
wmat.LL.C <- function(x, y, n, j, e1)
{
W <- matrix(0, 3, 3)
jp1 <- j + 1
W[1, 1] <- e1 * n
W[1, 2] <- e1 * (sum(x[1:j]) + (n - j) * x[j])
W[1, 3] <- e1 * sum(x[jp1:n] - x[j])
W[2, 2] <- e1 * sum(x[1:j] * x[1:j]) + e1 * (n-j) * x[j] * x[j]
W[2, 3] <- e1 * x[j] * sum(x[jp1:n] - x[j])
W[3, 3] <-e1 * sum((x[jp1:n] - x[j]) * (x[jp1:n] - x[j]))
W[2, 1] <- W[1, 2]
W[3, 1] <- W[1, 3]
W[3, 2] <- W[2, 3]
list(w = W)
}
rvec.LL.C <- function(x, y, n, j, e1)
{
R <- array(0, 3)
jp1 <- j + 1
y1j <- sum(y[1:j])
yjn <- sum(y[jp1:n])
xy1j <- sum(x[1:j] * y[1:j])
xyjn <- sum(x[jp1:n] * y[jp1:n])
R[1] <- e1 * (y1j + yjn)
R[2] <- e1 * (xy1j + x[j] * yjn)
R[3] <- e1 * (xyjn - yjn * x[j])
list(r = R)
}
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