similar to: Help load a package into R

Dear list   I have 5 markers that can be used to detect an infection in combination. Could you please advise me how to use functions in ROCR/ other package to produce the ROC curve for a combination of markers?   I have used the following to get ROC statistics for each marker. pred <- prediction(y$marker1, y$infectn) perf <-performance(pred,"tpr","fpr")

Dear List,   I have some longitudinal data, each patient was followed at times 0, 12, 16, 24 weeks and measure severity of a illness (0-worse, 1-same, 2-better). So, longitudinal response is categorical.  I was wondering whether lmer in R can fit a model for this type of data. If so, how we code? Or any other function in R that can fit this type of longitudinal data? Any suggestion would be

Dear List,   I am new to ROC analysis and the package ROCR. I want to compute the confidence intervals of sensitivity and specificity for a given cutoff value. I have used the following to calculate sensitivity and specificity:   data(ROCR.simple) pred <- prediction(ROCR.simple$predictions, ROCR.simple$labels)   se.sp <- function (cutoff, performance) {     sens <-

Hi   I am using following code to produce a xyplot for some longitudinal data. There are 2 panels. It produced all longitudinal trajectories with mean profile. But since the dataset it very large plot looks very messy. I want to show, say 10 randomly selected individual longitudinal trajectories together with mean profile for entire dataset. Could any help me to alter the following code to do

Dear all, I'm working with satellite images in R and plotting them via the code below. I was wondering whether coordinates (spatial["x"], spatial["y"]) are used as centre coordinates of the pixels in the GRID? In this script; spatial["x"] & spatial["y"] are the centre coordinates of the satellite image pixels. I'm asking this because some

Hello, Does anyone know whether a Windows version of the Ratings package will be available? Thank you, Paul Prew CONFIDENTIALITY NOTICE: \ This e-mail communication an...{{dropped:11}}

Hello I'm working with a large hydrological data set stored in a netCDF format. The file stores x and y coordinates in the UTM projected coordinate system, yet when I use image to graphically display the z variable, the image is distorted in the sense that it does not plot the map in the correct spatial organization. I'm wondering if I need to define the projection of the netCDF file

Dear All, I try to use Sweave to make a document. But when I use the Sweave() command on it and build a pdf with pdflatex (3.141592-1.40.3) my apostrophes are replaced by some gibberish (an 'a' with a hat on it, a capital A with a arc pointing upwards on it and a capital Y with two points on it). If I manually replace the apostrophes using the keyboard, I get a different looking

I have a spatialpixelsdataframe containing bathymetry data. Is it possible to save this as something similar to the meuse.grid so it can be loaded without having to run the spatial interpolation each time the script is called? I don't see a straightforward method in the sp documentation.

Dear Lister, I understand I can put '#' to put comment line by line. But is there a way to put comment with multiple lines without having to put '#' on the every line? Thanks.

Hello 'R' Users, I have a monthly mean CO2 necdf data file defined on 1x1 lat by lon coordinate. I want to sub-sample this variable CO2 on the coordinates of another ASCII data file. The coordinates of another ASCII data file are as: -24.01 152.06 -18.58 150.19 -13.46 148.35 -8.29 147.03 -3.14 146.19 1.53 145.59 7.08 145.33 12.25 145.02 17.46 144.31 22.44 142.35 27.53 141.26 33.04

Is there a way to run a simple perl script from R? Kenneth B. Pierce Jr. Research Ecologist Landscape Ecology, Modeling, Mapping and Analysis Team PNW Research Station - USDA-FS 3200 SW Jefferson Way, Corvallis, OR 97331 ken.pierce@oregonstate.edu 541 750-7393 http://www.fsl.orst.edu/lemma/gnnfire http://www.fsl.orst.edu/R_users/index.php [[alternative HTML version deleted]]

Hi Sorry for banal question How to create empty data frame with for example 30 variables without typying: data.frame(x=1,y=1....) Jarek

Dear All, In a package, I want to use PCA function. The structure I used follow this page: http://www.statmethods.net/advstats/factor.html. fit<-principle(mydata, nfactors=9, rotation=TRUE) or: result<-PCA(mydata) But I don't known why R language in my computer noticed: "not found principle", "not found PCA". I download and installed

Dear R users and helpers, I'm trying to find an example of a histogram plot as an inset (upper right or left corner) of another histogram. Anyone has an example of that? Thanks for your help, V?ctor. -- ----------------------------------------------------------------------- V?ctor Homar Santaner Grup de Meteorologia Edif. Mateu Orfila Tel: +34 971 17 1376

I'm not sure this is the appropriate forum--please let me know if I should post somewhere else. I have Rpad version 1.3.0 set up on my webserver. It works, except that graphics are not displayed. They are created (i.e., when I run the example I see that graphics files are created in Rpad/server/xxxxxxxxx) but they don't appear on the web page. Everything else seems to be working. Any help

I have a script that sometimes produces the following error: Error in assign(".target", method at target, envir = envir) : formal argument "envir" matched by multiple actual arguments Do you think this is a memory issue? I don't know what else it could be as it doesn't always occur even if the script is run with exactly the same data. Does rm() actually free up

Hello, I have problem I have a, and b in regression then I can't plot x,y with (and) a, b lines can you help me ? thx [[alternative HTML version deleted]]

I hope this is not a stupid question, but I am having difficulty importing data from sources like CDs, HDD, or flashcards. Can anyone help ? Joe [[alternative HTML version deleted]]

Hi! Is there a Gui for R with improvements in the command line? I'm not looking for buttons, menus and etc, but (more) colored syntax, auto-complete commands and etc? Best regards, Raphael Saldanha saldanha.plangeo@gmail.com [[alternative HTML version deleted]]