Displaying 20 results from an estimated 186 matches for "pursuits".
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pursuit
2004 Mar 17
6
projection pursuit
Dear helpers
Does R have a package that performs projection pursuit density estimation? Or
anyone knows code in Matlab or C for example to do this?
Thank you all
Luis
2005 Jul 11
1
Projection Pursuit
Hello,
Just a quick question about ppr in library modreg.
I have looked at Ripley and Venables 2002 and it says that projection
pursuit works "by projecting X in M carefully chosen directions"
I want to know how it choses the directions? I presume it moves around the
high-dimensional space of unit vectors finding ones that separate the
response variables, but how.
I looked at the
2011 May 31
1
Projection Pursuit Index
Dear R-developers,
I am trying to experiment with projection pursuit (PP), and different
indexes for the same, especially using the tourr package. However, I've
noticed that a PP index in the said package is only a function of the
projected data. Could I modify the function so that the index sees the
projection bases instead (or in addition to the data) ?
Alternatively, if some other package
2005 May 13
0
df and gcvpen for parameters selection on projection pursuit regression
Hello,
I am using projection pursuit regression parameters selection.
Does anyone has experience on the range to test for df parameter (spline kernel) and gcvpen (gcvspline kernel)?
I don't find any information about this.
Thanks in advance.
Joao Moreira
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2011 Feb 16
0
Constraints in projection pursuit regression
Hi,
I am solving a projection pursuit regression problem, of the
form y = \sum_i f_i (a_i^T x), where a_i are unknown directions, while
f_i are unknown univariate link functions. The following is known about
each f_i:
1. f_i (0) = 0 (that is, each f_i passes through the origin)
2. f_i is monotonic.
Is there a way to ensure that the function ppr() in R produces solutions that respect the
2010 Jul 29
1
Crash report: projection pursuit & predict
Folks,
The projection pursuit regression function in the base R seems to crash when the optimization level is set to zero, i.e. the initial ridge terms are accepted without refitting. I encountered this problem in an out-of-sample prediction exercise using predict. But further investigation suggests the issue is with the ppr fit and predict just sppeds up the crash. The other optlevels seem to be
2008 Oct 28
1
Source code for ppr (Projection Pursuit Regression)
Dear R users,
I am looking for the source code of the implementation of ppr (Projection
Pursuit Regression) in R.
It will be great if citations of the source papers on which the
implementation is based, are also provided.
Thank you,
Arvind Iyer,
Grad student, Deptt. of Biomedical Engineering
Viterbi School of Engineering
University of Southern California, Los Angeles
[[alternative HTML
2006 Apr 10
6
"Pursuit of Happiness" ? Are you sure ?
I always kind of liked this title (the title of Davids super Rails
presentation), but then I saw this quote today:
"The pursuit of happiness is a most ridiculous phrase; if you pursue
happiness you''ll never find it." by C.P Snow
I''d have to agree with this quote. It''s the same as love... go looking for
it, and you''ll never find it.
Soooo... David,
2000 Sep 01
1
Help with Projection Pursuit, ppr().
Hi,
Recently, I installed the 1.1.0 version of R (for Windows), since it includes an implementation of Projection Pursuit (I failed to write my own version of PP as a standalone C++ program).
As far as I know, R offers two interfaces/sintax for the ppr() function. The first one requieres a regression formula and a data frame. The other requieres X, a matrix with the explanatory variables, and Y,
2009 Jan 07
0
fixed effect significance_NB mixed models_further pursuit
7 Jan 09
Hello,
I am using R version 2.7.0 in a Windows XP context.
I am also using the glmm.admb package (created by Dave Fournier, Hans
Skaug, and Anders Nielson) to run mixed-effects negative binomial
models.
To the best of my knowledge and ability, I have searched and studied
the R-help, R-sig-mixed models, and ADMB NBMM for R (through Otter
Research Ltd) list servs; R help
2010 Apr 14
3
pdMat
Alguien tiene experiencia en escribir una pdMat. Para aquellos que no lo
recuerden son las matrices de covarianzas de los efectos aleatorios que
ajusta la función lme de la librería nlme
Estas matrices tiene especial importancia en aplicaciones de genética de
poblaciones y en particular en mapeo de asociación. Pinheiro y Bates dicen
que el usuario puede crear sus propias pdMat y sugiere como
2017 Apr 15
2
help on listener connection stats
Hi,
I see two statistics on the admin web page.
On my system "listeners" is usually 0. Sometimes I will
actually catch it at 1 or 2, but it is 0 99% of the time.
On the other hand "listener_connections" is always
going up. If I refresh the screen it goes up by a few.
If I wait an hour and refresh it goes up by tens.
Over a few days it goes up by hundreds.
What is this
2007 Dec 20
2
factor manipulation: edgelist to a matrix?
Hello All,
I have had considerable bad luck with attempting the following with for
loops. Here is the problem:
# Suppose we have a data.frame with the following data, which can be
considered a type of edgelist (for those with networks backgrounds):
#
# V1 V2
# 1 A
# 1 A
# 1 B
# 2 A
# 3 C
# 3 A
# 3 C
# 3 B
#
# I want the output of the function to produce a matrix, such that #each
factor of
2013 Aug 13
2
Closing sf.net issue tracker
As part of the ongoing move of FLAC's project hosting from
sourceforge.net to xiph.org, we're planning to remove the issue tracker
there. Erik doesn't check it, so issues filed there are just rotting,
and that's a poor experience.
We don't have a decent alternative at xiph.org at the moment. We've
variously discussed setting up a bugzilla instance or using github. In
the
1999 Jan 21
0
Re: help with R/S functions on nonpar. regression
>>>>> "Jose" == Jose Ramon G Albert <toots at info.com.ph> writes:
Jose> I have just downloaded this freeware version of R (which seems
Jose> to be a clone of S). I was wondering if anyone knows where I
Jose> could obtain R or S functions which provide nonparametric
Jose> regression curves, e.g. kernel estimators or smoothing
Jose> splines.
2000 Mar 09
1
What is XGobi and what is it for?
I've seen XGobi come up in here from time to time, and I wonder what is
it, what is it for, do I need it? How about throwing me a bone here!
--
Paul E. Johnson email: pauljohn at ukans.edu
Dept. of Political Science http://lark.cc.ukans.edu/~pauljohn
University of Kansas Office: (785) 864-9086
Lawrence, Kansas 66045 FAX: (785)
2001 Mar 01
1
Kohonen's SOM in R?
Is there an implementation of the SOM ('Self Organizing Map') procedure in
R ?
I am aware of the implementations of Sammon mapping, multidimensional
scaling and, somewhat peripherally, principal curves and projection
pursuit .. but not SOM per se as far as I can see. Am I missing
something?
---------------------
for anyone interesed in SOM
I found Samuel Kaski's thesis
2013 Oct 24
2
Rarezas con boot
la libreria lm4 cambio con la versón 3 de R. Fijate en las versiones
Prof. Julio Di Rienzo
Estadística y Biometría
FCA- U.N. Córdoba
IBS-RARG President
http://sites.google.com/site/juliodirienzo
"Biometry, the active pursuit of biological
knowledge by quantitative methods."
(R.A. Fisher, 1948)
2013/10/24 Carlos Ortega <cof@qualityexcellence.es>
> Hola,
>
> Quizás para
1998 Aug 31
0
Packages aov, modreg, lqs, psplines
I now have versions of code that is destined (I believe) for 0.63 which
is in a suitable state for comment. The files are at
ftp://ftp.stats.ox.ac.uk/pub/R
(Our www server is being moved, so may be intermittently down, but this
ftp server should be stable.) All are R packages, for the moment for
personal use only (no re-distribution). Use with 0.62.3 or 0.63 (although
I am aware of some
2001 Jun 08
1
:predict.ppr
Hi all,
I am doing a projection pursuit regression using the ppr() function from
modreg.
I would also like to use predict.ppr(). However, I cannot find any
information about it in the help files. There is a link to predict.ppr
in the index for modreg, but that link is to the help for ppr().
Has predict.ppr() not been implemented?
If not, does anyone have a suggestion as to how to implement