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Calling tree :

cobs()
    |
    |-> shat()
    |   |
    |   \-> dn
    |
    |--> getdim2()
    |
    |-> qbsks()
    |   |
    |   |
    |   v
    \-> drqssbc2()
        |   /^
        |  /  (possibly calls itself once)
        |--
        |
        |-> l1.design2()
        |
        |-> loo.design2()
        |
        |-> rq.fit.sfn()   {quantreg}
        |
        \-> rq.fit.sfnc()  {quantreg}

qbsks(x,y,w,pw, knots,nknots, degree,Tlambda,constraint, equal,smaller,greater,gradient, coef,maxiter, pswitch, n.equal,n.smaller,n.greater,n.gradient, nrq,nl1, neqc, nj0, tau,lam,tmin,kmax,lstart, ks,mk.flag, knots.add, ic, print.mesg, factor,print.warn)

drqssbc(x,y,w,pw, knots, degree,Tlambda,constraint, equal,smaller,greater,gradient, coef,maxiter, pswitch, n.equal,n.smaller,n.greater,n.gradient, nrq,nl1, neqc,niqc, nvar,nj0, tau,lam,tmin,kmax,lstart, factor,print.warn)

The following relates to the older COBS version, nowadays in package cobs99

COBS – Constrained B-splines (Version 1.0)

COBS is a constrained B-splines algorithm that computes constrained quantile curves using linear or quadratic splines. The median spline may be used as an attractive alternative to constrained smoothing.

A postscript version of the paper that describes the detail of COBS can be downloaded from http://www.cba.nau.edu/pin-ng/cobs.html

This is a beta version (no longer the case)

We do appreciate comments and suggestions. Please send bugs or problems to Martin Maechler maechler@stat.math.ethz.ch and also pin-ng@nau.edu or he@bahadur.stat.uiuc.edu

Martin Maechler maechler@stat.math.ethz.ch http://stat.ethz.ch/~maechler/ Seminar fuer Statistik, ETH-Zentrum LEO C16 Leonhardstr. 27 ETH (Federal Inst. Technology) 8092 Zurich SWITZERLAND

Pin T. Ng College of Business Administration PO Box 15066 Flagstaff, AZ 86011-5066 vox: (928) 523-8726 fax: (928) 523-7331 e-mail: Pin.Ng@nau.edu url: http://www.cba.nau.edu/pin-ng

old affiliations :

Pin T. Ng           Xuming He
Department of Economics     Department of Statistics
University of Illinois      University of Illinois
Champaign, IL 61820     Champaign, IL 61820

Dec 20, 2001: Prof. Pin T. Ng explicitly allowed Martin Maechler to port and distribute this for R.

–> First public release to CRAN, 18 April 2002, version 0.9-3

See also the following files

Martin Maechler maechler@stat.math.ethz.ch http://stat.ethz.ch/~maechler/ Seminar fuer Statistik, ETH-Zentrum ETH (Federal Inst. Technology) 8092 Zurich SWITZERLAND

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
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