thanks everybody. I also just read Dirk E's high-performance computing  
tutorial. now I wonder: would it be faster to compile a C version of  
Gentleman's algorithm for WLS into R? before I waste a few days trying to  
program this in and getting it all to work together, would the end result  
likely be a good speedup, or more likely be a waste of my time? any hunches?

regards, /iaw

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