Are xt, yt, and zt arrays where t is time and so they are arrays where each element is a different time point? Why is xt on both sides of the equation? Or is it really something like this:
x(t) = 0.001 + 0.49 * x(t - 1) + 0.046 * y(t) + 0.11z(t)
and you have this in a loop over t so that a given x depends on the prior x element and the current y and z elements? Can you supply typical values for x(1), and yt and zt?
