similar to: Howto compile chemometrics package from source

Hello i need some precision about nipals in the chemometrics package in R . When i use nipals in chemometrics i obtain T and P matrix. I really don't understand what to do with these two matrix to obtain the scores for every the component (like in spss fo example) Comp1 Comp2 Comp3 quest1 0,8434 0,54333 0,3466 quest2 0,665 0,7655 0,433 Thank you very

Dear All, A new task view "ChemPhys" on chemometrics and computational physics is available on CRAN (http://cran.r-project.org/web/views/ChemPhys.html). It describes packages and functions that are of use in modeling chemical/physical systems. Suggestions and comments regarding this task view are welcome. If you think a new category, package or function should be added, please mail.

Dear Mr. Beginning to work on Linux. I am trying to install R into Ubuntu Gustsy. I installed version 2.5.1 and worked fine. But then I tried to upgrade by adding these lines to sources.list: deb http://cran.fiocruz.br/bin/linux/debian etch-cran/ deb http://cran.fiocruz.br/bin/linux/ubuntu gutsy/ I introduced the authorization keys (as recommended) and the files were downloaded. But then I

Maybe someone out there has done this already .... (which would save me some time): For a repetitive chemometric task I need to retrieve spectra from a Nicolet IR acquisition system into R and analyze them there. The raw spectra are in files ending in the extension .spa. I can use the Omnic software to export them to .csv, but I would like to skip this step since it is manual. Has anyone of you

Greetings R Developers, I've been testing the alpha release of R-3.0.0 and I noticed that the plotting functionality in package tkrplot was not working correctly. Further diagnosis found the issue to be related to the command '.Tcl("image create Rplot plotname")' from package "tkrplot". The following example is taken from here:

To the R help list, When using a data frame, there is no warning or error message when I refer to a non-existent variable inside the data frame. Example: ##---------------------------------------------- a <- c(1,2,3) b <- c(11,22,33) df <- data.frame(a,b) df ## correct: there is a column in df named 'a' ## the sum is correctly performed sum(df$a==2) ## incorrect: there is

Dear colleagues, I'm conducting a meta-analysis of studies evaluating adherence of HIV-positive drug users into AIDS treatment, therefore I'm looking for some advice and syntax suggestion for running the meta-regression using proportions, not the usual OR/RR frequently used on RCT studies. Have already searched already several handbooks, R-manuals, mailing lists, professors, but... not

Hello All. I must be missing the really obvious here: mm <- function(d, i) median(d[i]) b1 <- boot(gravity$g, mm, R = 1000) b1 b2 <- boot(gravity$g, mm, R = 1000, strata = gravity$series) b2 Both b1 and b2 seem to have done (almost) the same thing, but it looks like the strata argument in b2 has been ignored. However, str(b1) vs str(b2) does show that the strata have been noted

de Jong, S. (1993) SIMPLS: an alternative approach to partial least squares regression. Chemometrics and Intelligent Laboratory Systems, 18, 251?263 Thanks

Dear all, I want to do the following process as a loop ( to run automatically with dimension of X, here 50). How can I do that? Your cooments will be highly appreciable. Alex *# Code:* library(lars) library(chemometrics) X<-matrix(rnorm(2500),ncol=50) dim(X) # [1] 50 50 X1<-X[,2:dim(X)[2]] # I have taken out first column dim(X1) #[1] 50 49 X2<-X1[2:dim(X1)[1],] #

Sorry for the somewhat nondescript subject line, but I have two questions: 1. What is a really good book on R for a nonprogrammer? 2. How do I open more than one R Graphics: Device 2(ACTIVE). That what is the R command that I can use to keep more than one plot open. I am running a script from a book on Chemometrics that results in more than one graph during the execution, but

To the R-help list, In the documentation of the prop.trend.test function in the stats package, no bibliography has been provided which would allow one to find out the theoretical basis of that function and/or details of its implementation. May I suggest that some bibliography be included, as it generally happens with other statistical functions. I currently use R 2.8.0 running on Windows XP.

Hi all, have anybody already heard about Xgl? Do you know if there are rpm's for it? thx Nick -- Nicholas Anderson Administrador de Sistemas Unix LPIC-1 Certified Rede Fiocruz

Hi, Does anyone know if there is a function to find the maximum likelihood estimates of glm using Newton Raphson metodology instead of using IWLS. Thanks Valeska Andreozzi -------------------------------------------------------- Department of Epidemiology and Quantitative Methods FIOCRUZ - National School of Public Health Tel: (55) 21 2598 2872 Rio de Janeiro - Brazil

Dear R-list members, I am trying to put a legend just outside the plotting area of a graph. 1. Is there some way to plot symbols on the figure margin, in the same way as function "mtext" can write on the margin? 2. Is there some way to use the "legend" function (or some equivalent function) to plot a legend on the figure margin? 3. Any other way to plot either symbols or a

Hello Again Gurus and Lurkers: I?m trying to build a very user-friendly function which does aov without having the user type in a formula (which would be tedious in this case). The idea is to take the response from a PCA score matrix, and the factors from a list. A simple example is the function given below, along with test data and a sample call to the function. I'm certainly having

Dear R list members, How to produce barplots anchored to the x-axis (not floating above the x-axis) with a box around? With both following codes, the lower horizontal line of the box is below the y = 0 line: # first code x <- c(1,2,3,4) barplot(x,yaxs='i') box() # second code x <- c(1,2,3,4) op <- par(yaxs='i') barplot(x) box() par(op) The parameter yaxs='i'

Hi, I would like to estimate coefficients using poisson regression and then get standard errors that are adjusted for heteroskedasticity, using a complex sample survey data. Then I will calculate prevalence ratio and confidence intervals. Can sandwich estimator of variance be used when observations aren?t independent? In my case, observations are independent across groups (clusters), but

One of the outcomes of useR! 2006 is that JSS is planning to publish a series of special volumes. They will be guest edited (I have guest editors already, although somewhat tentative in some cases). Each volume will have 5-10 issues (articles) of the usual JSS format. Psychometrics in R Political Methodology in R Econometrics in R Social Science Methodology in R Spectroscopy/Chemometrics in R

Dear R-helpers, I am looking, quite unsuccesfully, for a number of functions/packages. Firstly, I am interested in a package for partial least squares. I have found that there seemed to exist a package called pls, but which seems not to run any more with modern versions of R. I have not been able to find certain "chemometrics package" I found some people discussing about in this