I'd be much obliged...
Doug Kent
Psychology Dept.
University of N. Carolina
Chapel Hill, N.C. 27514
919-966-3540
... decvax!mcnc!unc!kent
There are algorithms readily available in LINPACK and TOMS 581.
They are available for a small distribution charge from IMSL, though
you should be able to find someone else who has them already. The
algorithm in TOMS is the more efficient.
Alan Miller