search for: wehren

...eem to find a way to do this for a variable number of rows, e.g. if woppa has 10 or 15 rows I now manually cut and paste to have 10 - 15 arguments in the order function. There has to be a clever way to do this... Ron -----------------------+-------------------------------------------------- Ron Wehrens | " In a purely metaphorical sense, I am a turnip " Dept. of Chemometrics | (W.A. Quayle) University of Nijmegen | Email: rwehrens at sci.kun.nl Toernooiveld 1 | http://www-cac.sci.kun.nl/cac/rwehrens 6525 ED Nijmegen |...

Dear R-users, dear Ron I use pls from the pls.pcr package for classification. Since I need to know which variables are most influential onto the classification performance, what criteria shall I look at: a) B, the array of regression coefficients for a certain model (means a certain number of latent variables) (and: squared or absolute values?) OR b) the weight matrix RR (or R in the De

Hi, I got the same problem like http://tolstoy.newcastle.edu.au/R/devel/04/11/1204.html R crashes when I use the em function from the mclust package on univariate data and on a special case on bivariate data (when the matrix is not provided as written in the manual). It seems as if the problem is the format of the data to be analyzed. Operating System: Windows XP (SP2) R version: R-2.0.1 The

...ce and CRAN libraries. Is there a global variable so that R searches also other directories for sources when installing libraries? BTW, this can also be handy when installing new R versions... Any help appreciated. Ron ---------------------+-------------------------------------------------- Ron Wehrens | " In a purely metaphorical sense, I am a turnip " Analytical Chemistry | (W.A. Quayle) Catholic University | Email: rwehrens at sci.kun.nl Toernooiveld 1 | http://www-cac.sci.kun.nl/cac/rwehrens 6525 ED Nijmegen | Tel: +31...

...function to R (otherwise it would probably have been done already). I greatly appreciate the flexibility of the Splus image.legend function since it allow you to put the legend where and how you want. Just to add one vote for image.legend (or subplot, which would be even better). Zivan Ron Wehrens <rwehrens at sci.kun.nl> le 14/07/2000 15:36:47 Pour : r-help at lists.R-project.org (Rhelp) cc : (ccc : Zivan KARAMAN/LMGC/Limagrain) Objet : [R] image legend Hi, are there any plans to incorporate something like the Splus image.legend function? Or an optional argument to image...

Hello, I am a beginner in R, and I wonder if anyone could help me with a partial least square regression in R. I have looked up the instructions and the manual from Bjorn Mevi and Ron Wehrens. However, I think I managed to write the script correctly, but I dont understand the output on the R environment, and also how to decide on the number of components to use (from the RMSEP), and also how to do a correlation plot. I welcome any help or advice! Thanks! Margarida Soares PhD Student...

Dear All; While using EMclust() in the mclust package, I frequently encountered a program error. A message window popped up with the message " Rgui.exe has generated errors and will be closed by Windows. You will need to restart the program. An error log is be created." > version _ platform i386-pc-mingw32 arch i386 os mingw32

...quot;somdata.csv") # Create test and training sets from data: inTrain <- sample(nrow(somdata), nrow(somdata)*(2/3)) training <- somdata[inTrain, ] testing <- somdata[-inTrain, ] # Supervised kohonen map, where the dependent variable is MEAS_TC. # Attempting to follow the examples in Wehrens and Buydens, 2007, 21(5), J Stat Soft. # somdata[1] is the MEAS_TC variable somX <- scale(training[-1]) somY <- training[[1]] # Needs to return a vector # Train the map (not sure this is how it should be done): tc.xyf <- xyf(data=somX, Y=somY, xweight=0.5, grid=somgrid(6, 6, "hexago...

Hi all, I would like to do some QSAR analysis (quantitative structure activity relationship). I need to use some Partial Least Squares (PLS) regression, but I have not seen this option on the R-project. Is it possible to do this kind of regression on R? thank you in advance best regards, olivier [[alternate HTML version deleted]]

...cores and loadings, and calculation of (R)MSEP and R2 - A simple multiplicative scatter correction (msc) implementation - Functions for plotting predictions, validation statistics, coefficients, scores, loadings and biplots. (The pls package is meant to supersede the pls.pcr package.) -- Ron Wehrens and Bj??rn-Helge Mevik _______________________________________________ R-packages mailing list R-packages at stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-packages

...gs plot (corrplot). - New argument `varnames' in coefplot, to label the x tick marks with the variable names. - loadingplot, coefplot and plot.mvrVal can now display legends, with the argument 'legendpos'. See CHANGES in the sources for all changes. -- Bj??rn-Helge Mevik and Ron Wehrens _______________________________________________ R-packages mailing list R-packages at stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-packages

...cross-validation. - Line plot parameter arguments have been added to predplotXy(), so one can control the properties of the target line in predplot(). - MSEP(), RMSEP(), loadings(), loadingplot() and scoreplot() are now generic. See the file CHANGES in the sources for all changes. -- Ron Wehrens and Bj??rn-Helge Mevik _______________________________________________ R-packages mailing list R-packages at stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-packages

...ral pages now only set `par(ask = TRUE)' if the plot device is interactive (suggested by Kevin Wright). - mvr() and mvrCv() now check for near zero standard deviation when autoscaling (`scale = TRUE') See the file CHANGES in the sources for all changes. -- Bj?rn-Helge Mevik and Ron Wehrens _______________________________________________ R-packages mailing list R-packages at r-project.org https://stat.ethz.ch/mailman/listinfo/r-packages

...could be useful in other plots as well, where the radius of the circle is a measure of the value in the third dimension. And yes, I do not like pie charts at all, but sometimes one has to do what one has to do 8-) Ron ---------------------+-------------------------------------------------- Ron Wehrens | " In a purely metaphorical sense, I am a turnip " Analytical Chemistry | (W.A. Quayle) Catholic University | Email: rwehrens at sci.kun.nl Toernooiveld 1 | http://www-cac.sci.kun.nl/cac/rwehrens 6525 ED Nijmegen | Tel: +31...

...le functions for teaching and spent hours writing the documentation for my students who now may not even be able to read it... aarghh Apologies if this is a FAQ, couldn't find anything on it in the archives. Ron ---------------------+-------------------------------------------------- Ron Wehrens | " In a purely metaphorical sense, I am a turnip " Analytical Chemistry | (W.A. Quayle) Catholic University | Email: rwehrens at sci.kun.nl Toernooiveld 1 | http://www-cac.sci.kun.nl/cac/rwehrens 6525 ED Nijmegen | Tel: +31...

...lar_t level; /* protocol level affected */ t_uscalar_t name; /* option to modify */ t_uscalar_t len; /* length of option value */ }; Is there anything I can do to get around this? Ron ---------------------+-------------------------------------------------- Ron Wehrens | " In a purely metaphorical sense, I am a turnip " Analytical Chemistry | (W.A. Quayle) Catholic University | Email: rwehrens at sci.kun.nl Toernooiveld 1 | http://www-cac.sci.kun.nl/cac/rwehrens 6525 ED Nijmegen | Tel: +31...

Dear R-helpers, Has anybody ever tried to compare pls regression outputs from the pls.pcr R-package developped by Wehrens with outputs from the Unscrambler software developped by CAMO company ? I find very different outputs and wonder if this comes from differences between methods/algorithms SIMPLS (pls.pcr) and PLS1 (Unscrambler). Arnaud ************************* Arnaud DOWKIW Department of Primary Industries J. B...

...cores and loadings, and calculation of (R)MSEP and R2 - A simple multiplicative scatter correction (msc) implementation - Functions for plotting predictions, validation statistics, coefficients, scores, loadings and biplots. (The pls package is meant to supersede the pls.pcr package.) -- Ron Wehrens and Bj??rn-Helge Mevik _______________________________________________ R-packages mailing list R-packages at stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-packages

...cross-validation. - Line plot parameter arguments have been added to predplotXy(), so one can control the properties of the target line in predplot(). - MSEP(), RMSEP(), loadings(), loadingplot() and scoreplot() are now generic. See the file CHANGES in the sources for all changes. -- Ron Wehrens and Bj??rn-Helge Mevik _______________________________________________ R-packages mailing list R-packages at stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-packages

...ral pages now only set `par(ask = TRUE)' if the plot device is interactive (suggested by Kevin Wright). - mvr() and mvrCv() now check for near zero standard deviation when autoscaling (`scale = TRUE') See the file CHANGES in the sources for all changes. -- Bj?rn-Helge Mevik and Ron Wehrens _______________________________________________ R-packages mailing list R-packages at r-project.org https://stat.ethz.ch/mailman/listinfo/r-packages