Hi, I wan?t to calculate the Lyapunov exponents of several time series (16 years of weekly observations each with a strong seasonal component). I?ve got a reference that compares three methods: Feedforward Neural Networks, Thin-Plate Splines and Response Surface (Ellner & Turchin 1995, American Naturalist 145(3),343-375). How can I estimate Lyapunov exponents (global and local) in R by any or all of this techniques? Thanks for any advice, Gregorio Fernandez