?isoreg has isoreg(x, y = NULL) Arguments: |x, y| in |isoreg|, coordinate vectors of the regression points. Alternatively a single ?plotting? structure can be specified: see |xy.coords <cid:part1.02070302.03090407@acelerate.com>|. |...| potentially further arguments passed to methods. the ... dots seem superfluous. Additionally, the help p;age could need \concept{monotonic} or \concept{monotonic regression} Kjetil Halvorsen. Peace is the most effective weapon of mass construction. -- Mahdi Elmandjra -- No virus found in this outgoing message. Checked by AVG Anti-Virus.