Bayesian modeling Fill's algorithm Gibbs sampler Ising model Markov field Stochastic simulation Swendsen - Wang -algorithm bayesilainen menetelmä inhomogeneous point processes log Gaussinen Coxin prosessi log-Gaussian Cox processes multivariate point patterns networks non-stationary Gibbs models random fields secondary structures spatial biodiversity spatial point patterns tila-avaruudelliset pistekuviot tilastotiede