In regard to validation of R, there are test directories with test 
code. See for example:
https://svn.r-project.org/R/trunk/tests/
and
https://svn.r-project.org/R/trunk/src/library/stats/tests/

David Scott


_________________________________________________________________
David Scott     Department of Statistics, Tamaki Campus
                The University of Auckland, PB 92019
                Auckland 1142,    NEW ZEALAND
Phone: +64 9 373 7599 ext 86830         Fax: +64 9 373 7000
Email:  [EMAIL PROTECTED]

Graduate Officer, Department of Statistics
Director of Consulting, Department of Statistics

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