If you'd like to have accurate second derivatives, then check out the "numDeriv" package, and in particular, the function "hessian". The derivatives are based on Richardson extrapolation, and can be evaluated to a very high degree of accuracy.
Ravi. -------------------------------------------------------------------------- Ravi Varadhan, Ph.D. Assistant Professor, The Center on Aging and Health Division of Geriatric Medicine and Gerontology Johns Hopkins University Ph: (410) 502-2619 Fax: (410) 614-9625 Email: [EMAIL PROTECTED] Webpage: http://www.jhsph.edu/agingandhealth/People/Faculty/Varadhan.html -------------------------------------------------------------------------- > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:r-help- > [EMAIL PROTECTED] On Behalf Of Rau, Roland > Sent: Tuesday, July 11, 2006 6:44 AM > To: Robert Mcfadden; r-help@stat.math.ethz.ch > Subject: Re: [R] Second Partial Derivatives > > Hi, > > > [mailto:[EMAIL PROTECTED] 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}} > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting- > guide.html ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
