# [Rd] Projects

**Kurt Hornik
**
Kurt.Hornik@ci.tuwien.ac.at

*Mon, 18 Sep 2000 00:51:12 +0200*

>>>>>* Douglas Bates writes:
*
>* I am teaching a graduate course on Statistical Computing this
*>* semester. A major part of the grade is determined by a project in
*>* which a student or small group of students produce, test, and document
*>* some software for statistics. I will encourage those students who are
*>* developing in S to package their software as an R package.
*
>* I would welcome suggestions of possible projects, especially projects
*>* that come under the heading of "Useful facilities to be added to R".
*>* Please keep in mind that the project must be completed by mid-December
*>* and that not all the students have extensive experience programming in
*>* S and C.
*
Hopefully not too late for me to join the wishlist ...
In addition to the useful suggestions re experimental design and by
Peter, I have the following ctest-related projects which I think would
fit very nicely. Ordering is according to decreasing priority.
* Improved support for exact inference (p-values and, where appropriate,
also confidence intervals ) for some of the tests, in particular for
Kruskal-Wallis and (2-sample) Smirnov. In addition, we currently don't
have exact p-values in the rank-based tests in case of ties, and one
could deal with this using the Streitberg-Roehmel path suggested by
Torsten Hothorn (see add-on package ExactDistr). Also, permutation
tests might be useful in some cases ...
[I have an NEW implementation of the Mehta-Patel network algorithm for
dealing with the common odds ratio in 2 x 2 x k tables ready, hence will
take care of mantelhaen.test() myself.]
* Implement alternative definitions of the 2-sided p-value using
p = 2[f P(X=x) + min{P(X<x),P(X>x)}]
with 0 <= f <= 1 as definition.
* Improve the code for fisher.test(), maybe re-implement from scratch?
The memory management definitely needs to be rewritten for 1.2.
-k
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