Re: [ROOT] prob. distributions

From: cstrato (aon.912121399@aon.at)
Date: Fri Mar 14 2003 - 20:35:45 MET


Dear Daniel

As Rene mentioned, I am currently working on a (limited) statistics package,
which implements some functions of the statistics software R 
(http://cran.r-project.org/)
as C++ classes for use from within ROOT.

Currently, I have wrapped some core functions from R Mathlib in a class 
TMLMath:
These are: dnorm, pnorm, qnorm, pt, qt, pbeta
(see R-help: http://stat.ethz.ch/R-alpha/R-patched/doc/html/packages.html)

Based on these functions I have implemented the R function t.test for 
student t-test,
and p.adjust (adjust p-values for multiple comparisons) as a class 
TStudentTest,
which is derived from a base class TUnivariateTest. (I intend to 
implement further
derived classes such as TWilcoxTest, TKruskalTest, but this will take 
some time.)

My intention is to supply a statistics package, which can deal with 
missing values.
I have sent Rene a first verion, which I have developed on MacOS X, but 
I hope,
that it will work on other architectures, too.

Best regards
Christian
_._._._._._._._._._._._._._._._
C.h.i.s.t.i.a.n S.t.r.a.t.o.w.a
V.i.e.n.n.a       A.u.s.t.r.i.a
_._._._._._._._._._._._._._._._

Rene Brun wrote:

>Hi,
>
>We do not have a Student distribution in the system today.
>However, Christian Stratowa is currently working on a new set of classes for
>statistics (TStatUtils) that includes the Student distribution.
>
>May be Christian will give more details.
>
>Rene Brun
>
>cano@ifca.unican.es wrote:
>  
>
>>Hi all,
>>I'm pretty new to this world of root, but I'm starting getting my way, so I was
>>wondering if there was something like the GetChisquare() or the
>>KolmogorovTest(), that I've already used, BUT for student's t distribution and
>>for F-test. I've searched for them but can't find, maybe they dont exist, anyway.
>>
>>Cheers
>>
>>Dani
>>
>>************************************
>>     Daniel Cano Fernández
>>           IFCA/CSIC
>>    Grupo de Altas Energías
>>    Universidad de Cantabria
>>      tfno  +34 942201536
>>            +34 942201466
>>   mailto: cano@ifca.unican.es
>>************************************
>>
>>-----------------------------------------------------
>>     ==== IFCA mail system. Trailer stamp. ====
>>    
>>
>
>
>  
>



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