[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
fac.design
oa.design
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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