Hi, > [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Robert Mcfadden > > Does R have any build-in function which allow me to count > second partial > derivatives numerically? library(nlme) ?fdHess I hope this is the direction you wanted to take. Best, Roland ---------- This mail has been sent through the MPI for Demographic Rese...{{dropped}}