NGMdata <-
function(n.obs=100, alpha=.5, beta=25, gamma=8, sig2w=10, sig2v=1, seed=90210)
{
set.seed(seed)
g = function(arg){c(arg[1],arg[1]/(1+arg[1]^2),cos(1.2*arg[2]))}
n = n.obs
sig2 = sig2v
tau2 = sig2w
sig = sqrt(sig2)
tau = sqrt(tau2)
theta = c(alpha,beta,gamma)
ptr = c(theta,tau2,sig2)
y = rep(0,n)
x = rep(0,n)
x0 = 0
Z = g(c(x0,0))
Fx = rep(0,n)
Fx[1] = sum(Z*theta)
x[1] = rnorm(1,Fx[1],tau)
y[1] = rnorm(1,x[1]^2/20,sig)
for (t in 2:n){
Z = g(c(x[t-1],t-1))
Fx[t] = sum(Z*theta)
x[t] = rnorm(1,Fx[t],tau)
y[t] = rnorm(1,x[t]^2/20,sig)
}
list(x=x, y=y)
}
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