importanceSSM(model, nsim = 1000, save.model = FALSE,
theta = NULL, antithetics = TRUE, maxiter = 100)SSModel.log(mean(y/u)) for Poisson and
log(mean(y/(u-y))) for Binomial distribution (or
log(mean(y)) in case of $u_t-y_t =
0$ for some $t$).importanceSSM simulates states of the
non-Gaussian state space model conditioned with the
observations, returning the simulated samples of the
states with the importance weights.