Doug Bates wrote
> >>>>> "Stefan" == Stefan Steinhaus <stst@informatik.uni-frankfurt.de> writes:
>
> Stefan> I would like to announce the third edition of my testreport
> Stefan> "Comparison of mathematical programs for data analysis"
> Stefan> which has just been finished. The testreport which is
> Stefan> written in English is available as PDF
>
> Stefan> file (Acrobat Reader) at the following website :
>
> Stefan> http://www.informatik.uni-frankfurt.de/~stst/ncrunch/index.html
>
.....
> By the way, it is not clear why one would want to calculate a
> determinant in the first place. The value usually came out to be
> Infinity in my tests because it was on the order of 5^1000 for a
> 1000x1000 matrix of uniform (0,1) random numbers.
I am concerned that the comparisons should do more to distinguish the
trivial or archaic from what is consequential. A quick scan reveals
the following:
1) An identify matrix (2.2) would be trivial to implement. Does
anyone miss it?
2) A matrix trace (2.2) would be trivial to implement.
3) The Crout decomposition (2.2) would be trivial to implement.
4) Isn't Bernoulli (2.5) just a Binomial with n=1?
5) Surely S-PLUS does have a quantile function (2.6).
6) The sign test is trivial to implement using pbinomial.
7) A Weibull plot would be trivial to implement; is it worth adding
as a specific form of plot?
Several other functions under 2.5 fall into the same category.
In several of these cases (1, 3, 4, 6 at least) one would just be
adding clutter, in my view. There may be a case for notes somewhere
on how to implement these functions, and even listings in the help.
John Maindonald email : john.maindonald@anu.edu.au
Statistical Consulting Unit, phone : (6249)3998
c/o CMA, SMS, fax : (6249)5549
John Dedman Mathematical Sciences Building
Australian National University
Canberra ACT 0200
Australia
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