I would be please to learn of any Splus/R code which
implements isotonic regression without recourse to compiled code. I have
downloaded (from Statlib) a Fortran version of the Pool-Adjacent-Violators algorithm
as described in the standard textbook on the subject:-
Barlow RE, Bartholomew DJ, Bremner JM and Brunk HD,
Statistical Inference under Order Restriction. John Wiley & Sons 1972.
I was wondering if anyone had coded a version of this or a similar
algorithm in S+/R? The Fortran code worked well but I wonder if it was
necessary.
John Steward
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Dr J A Steward MBBCh BA MSc PhD FFPH
Director Welsh Cancer Intelligence & Surveillance Unit
Rombourne House
14 Cathedral Rd
Cardiff CF11 9LJ
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tel +44 (0)29 20373500
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email:- john.steward@velindre-tr.wales.nhs.uk
website:- http://www.wcisu.wales.nhs.uk