Hi, I was looking for a routine that would do numerical integration using x,y data rather than integrating a function. Searching CRAN showed me the sfsmisc package, which contains integrate.xy. However the documentation mentions that its not good for noisy data and plans to implement the Romberg method. Is this the package that is generally used to perform this type of integration or are there other routines available? Thanks, ------------------------------------------------------------------- Rajarshi Guha <rxg218 at psu.edu> <http://jijo.cjb.net> GPG Fingerprint: 0CCA 8EE2 2EEB 25E2 AB04 06F7 1BB9 E634 9B87 56EE ------------------------------------------------------------------- Say it with flowers - give her a triffid