[Rd] Projects

Martin Maechler Martin Maechler <maechler@stat.math.ethz.ch>
Thu, 14 Sep 2000 18:46:41 +0200

1) Design of Experiments :

 - S (even before "-plus" existed) has had functions like

   fractionate   etc  ["White book", chapter 5].

		 [also a set of pre-stored useful fractional designs
		  for (> 2)-leveled factors.]

  Some of these would look like ``student exercises'' to do.
  If you could have them work in an environment where S-plus was *not*
  installed, this would end up as "clean table" project 
  w/o problematic code copying...

 - One could also think of  code for SEQUENTIAL design
  [do a  2^{m-k} (= 8) initially; 
   do a  (fractionated) n1 x .. x n_N on the remaining N important factors,
   given the data for the first 8 experiments].

 - Or "Taguchi" [- using (at least two) different kind of factors, some cheap,
		   some expensive to change
		 - multiple Y's, for some the "local" variance should be
		   minimized, etc etc
  This looks tedious and maybe can well be partitioned into different student
  projects.  Maybe JMC, AEF, RMH (authors of ch.5) or other experts can say
  much more here.


2) For Computer Scientists :
    "Differentiation" / Symbolic derivatives,..

   Improve the possibilities of  D() and deriv(), and document them.
   Make these user-extensible.

   Think about the hessian in addition to the gradient.



Martin Maechler <maechler@stat.math.ethz.ch>	http://stat.ethz.ch/~maechler/
Seminar fuer Statistik, ETH-Zentrum  LEO D10	Leonhardstr. 27
ETH (Federal Inst. Technology)	8092 Zurich	SWITZERLAND
phone: x-41-1-632-3408		fax: ...-1228			<><
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