search for: 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

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 code, but can't get deeper in than t...

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) ? Alter...

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 [[alternative HTML version deleted]]

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 tha...

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 fi...

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 ve...

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, emmerce yourself in Tao Te Ching,...

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, wich I presume is a m...

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

...marginar como armar algo a paritir de alli. Si hay algunos interesados en armar una librería de pdMat''s podría ser un buen proyecto grupal. Prof. Julio Di Rienzo Estadística y Biometría FCA- U.N. Córdoba IBS CC Member http://sites.google.com/site/juliodirienzo "Biometry, the active pursuit of biological knowledge by quantitative methods." (R.A. Fisher, 1948) [[alternative HTML version deleted]]

...ill 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 telling me? In pursuit of this question I started looking at the logs a little bit. I see a lot of connections happening, particular from a Bose Streaming Service (something like that) which can show 5-6 log entries in one second. What's up with that? Thanks for your help Chris Howard Classic Book Radio wmfh-lp.o...

..., and each corresponding value at position k of V2 is the i,j^th element of the new matrix, with missing values otherwise. The desired output should be: # [,1] [,2] [,3] [,4] # [1,] A A B NA # [2,] A NA NA NA # [3,] C A C B I have explored the reshape package as well as the network package in this pursuit, with no luck. Thanks, Chris Marcum UCI Sociology

...e 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 meantime, Erik said he would like to track and triage issues just though the mailing list. I pursuit of that goal, I'll go through the open issues in the sf.net tracker and post them here, then close them as they're addressed by Erik. I hope that way we can take down the tracker without missing any reports. There are quite a few, so list traffic will be higher than normal for a bit. -r

...wish. > library(help=modreg) ksmooth Kernel Regression Smoother loess Local Polynomial Regression Fitting loess.control Set Parameters for Loess loess.smooth Simple Smoothing via Loess plot.ppr Plot Ridge Functions for Projection Pursuit Regression Fit ppr Projection Pursuit Regression predict.loess Predict Loess Curve or Surface predict.smooth.spline Predict from Smoothing Spline Fit scatter.smooth Scatter Plot with Smooth Curve Fitted by Loess smooth.spline...

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)

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 "Data exploration using self-organizing maps" fairly accessible http://www.cis.hut.fi/~sami/thesis.ps and there is a wealth of mate...

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 caracterizar con más detalle donde estás teniendo problemas > podrías utilizar Rprof(), summaryRprof() y ver así donde se está...

...This is in I believe close to final form. modreg.tar.gz: ============= ksmooth Kernel Regression Smoother loess Local Polynomial Regression Fitting loess.control Set Parameters for Loess plot.ppr Plot Ridge Functions for Projection Pursuit Regression Fit ppr Projection Pursuit Regression predict.loess Predict Loess Curve or Surface predict.smooth.spline Predict from Smoothing Spline Fit scatter.smooth Scatter Plot with Smooth Curve Fitted by Loess smooth.spline...

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 no...