There was a deficiency in the argument list of the ufit() function in the Iso package which made it all too easy to conflate a specified location for the maximum with the *index* of that location in the "x" argument. This problem was kindly drawn to my attention by Zhiwei Zhang. The deficiency is remedied in the new version (Iso_0.0-21). The argument list for ufit() has changed. There is a new argument "imode" to specify the index of the location. The argument "lmode" is now restricted to being one of the entries of "x" (and an error is thrown if it is not). At most one of "imode" and "lmode" may be specified. The source of the new version is now available on CRAN, as is the Mac OSX binary. The Windoze binary should be available soon. Note that the change to Iso breaks the current version of the UMR package. The maintainer of UMR has been notified, and a revision of UMR should become available sometime in the near future. cheers, Rolf Turner -- Honorary Research Fellow Department of Statistics University of AucklandZhiwei Zhang Stats. Dep't. (secretaries) phone: +64-9-373-7599 ext. 89622 Home phone: +64-9-480-4619