search for: radiological

I start with a dataframe called xrays. It contains scores on films from each of two radiologists. It is in "long" format. I used the reshape package to melt a data frame and then cast it into "wide" format, one line for each patient (identified by redlognumb) with scores from both radiologists for a given patient on the same line. I named the result of the casting xrays.data.

I currently have a few CentOS 5.2 based Xen clusters at different sites. These are built around a group of 3 or more Xen nodes (blades) and some sort of shared storage (FC or iSCSI) carved up by LVM and allocated to the domUs. I am "managing" the shared storage (from the dom0 perspective) using cman+clvmd, so that changes to the LVs (rename/resize/create/delete/etc) are

First of all, let me apologize, as this is probably an absurdly basic question. I did search before asking, but perhaps my ineptitude didn't allow me to apply what I read to what I'm doing. Totally new to R, and haven't done any code in any language in a long time. Basically I've got categories. They're department codes for doctors (say, 9999 for radiology or 5555 for

I've decided to proceed down another path to solve this problem, at least until rsync is able. I've begun to code a perl script that keeps a lookup list of file and directory names to inodes. What will occur is the pointer list check will be run just before the rsync job and perform name changes and moves before rsync has it's chance. I've come to realize how complex this task is.

Hello. I am getting results from sem that are not correct (that's assuming that the results from my AMOS 4.0 software are correct). sem does not vary some of the parameters substantially from their starting values, and the final estimates of those parameters as well as the model chisquare value are incorrect. I've attached some code that replicates the problem. The parameters in

Hello, Dr. Viechtbauer. I am trying to perform a meta-analyis on a group of before-after studies using Metafor. I read your webpage including your correspondence with Dr. Dewey (https://stat.ethz.ch/pipermail/r-help/2012-April/308946.html), who also conducted a similar study. These information is very hepful, but I have one additonal question which I wonder if you can give me some instruction.

Hi Everyone, I have a question regarding the construction of 3D graphs in 'R', BUT these graphs also need to illustrate movement (with time) of the prostate gland (using radiological techniques). I am not sure how to do this in 'R' although I'm sure there is some way of doing it. Below, I have copied and pasted some of the data with which I'm working on. The data are for axial images of the prostate for four patients (N1, N2, N3 and N4) over 20 time points...

Dear "R" list, Our statisticians usually give us results back in a PDF format. I would like to be able to copy and past tables from "R" output directly into a Microsoft Word table since this will save us tons of time, be more accurate to minimize human copying errors and help us update data in our papers more easily. Do people have suggestions for the best way to do this? I

I have a sun machine (solaris 8) with R 1.3.0 installed. I want to install tcltk libraries to add gui support. Could someone please point me to the appropriate instructions? Thank you for your help. -- John CAREW <carew at mr.radiology.wisc.edu> Functional MRI Research Group Radiology E3/311 600 Highland Ave. Madison, WI 53792-3252 Phone: (608)265-5742 Fax: (608)265-9840

Hi. I tried running the following code. I don't understand the error. mydata <- read.table("C:/dataForR/radiology/wordFrequencies.csv", header=TRUE, sep=",") > dim(mydata) [1] 982 924 mydataN<-mydata[,-923] > dim(mydataN) [1] 982 923 cor(mydataN) factanal(mydataN, factors=3) Error in solve.default(cv) : Lapack routine dgesv: system is exactly singular

I'd like to use stripplot for some plots because I want to use the jitter parameter. On the other hand, I'd like to use dotplot because I'd like to have the horizontal lines that it includes. dotplot doesn't have a jitter option and I'm not having any success with getting panel.grid(h=-1) with stripplot. Can anyone show me how to make dotplot-like lines on a stripplot? Or

Hi, I can't find a simple command to switch the plot colors from paper to presentation formats. Has anyone defined styles that can be easily applied in one command? It would be nice to have a command for papers, using ps or eps outputs, that has a white background and colors that will print nicely on that. On the other hand, it would be nice to have exactly the same plot for a presentation

Dear all, The version of readBin() in R-devel includes a use of match(), through `%in%`, which can affect its performance significantly. By using primitives instead of the rather expensive call to match(), I reduce the time spent inside readBin() by more than 30% in some of my code (part of the tractor.base package). A simple patch that does this is given below. This passes "make

...e problem. Note that we did quite strange things with the fedora platforms: include explicitely slapack to provide simple precision for our (vanilla) armadillo... Do you have any idea, or even known problem in mind, that could be related to this ? Best regards, -- Dr. Yann Richet Institute for Radiological Protection and Nuclear Safety (https://www.irsn.fr), Department of Characterization of Natural Unexpected Events and Sites Office?: +33 1 58 35 88 84

Dear all, For an open-source project that I'm working on (1), which uses R for all its heavy lifting but includes a wrapper shell script, I was hoping to find a way to capture all warnings (and, in fact, errors too), and handle them in my own way. I realise I can do this for a single expression using something like: > f <- function(w) print(w$message) >

I'd like to make a plot showing frequency of an event. The data is in a data from that includes Year, Month and Day (of month) fields, so I created a Date with ISOdate(Year, Month, Day, tz=''). I can plot frequencies for the year 2002 with > thisyear <- Date[Year==2002] > hist( thisyear, xaxt='n' ) > axis.POSIXct( 1, at=seq(min(thisyear), max(thisyear),

Dear all, I have asked before, in R-help [1], about a way to create an interactive session in which commands are taken from a file or standard input - like R CMD BATCH but additionally allowing user input - but there was no response to that question, and the workarounds that I have found (using "expect", creating a temporary .Rprofile) are ugly and problematic. With the

Hi I'm fairly new to R and the list, so please take what I say accordingly! Far as I can see, strptime gives you a string in some specified format. In order to do any kind of numerically-based modelling with that, you need to obtain a number to work with. One way to do this is by getting the time with Sys.time() instead and coercing it to a number using as.integer(): >

Dear R people, I am trying to install rimage using install.packages("rimage") but am receiving the following errors despite having FFTW installed. I would appreciate any help to get this fixed. checking fftw.h usability... no checking fftw.h presence... no checking for fftw.h... no configure: error: Sorry, can't find fftw header ERROR: configuration failed for package

...trange things with the fedora platforms: include explicitely slapack to provide simple precision for our (vanilla) armadillo... > > Do you have any idea, or even known problem in mind, that could be related to this ? > > Best regards, > > -- > Dr. Yann Richet > Institute for Radiological Protection and Nuclear Safety (https://www.irsn.fr), > Department of Characterization of Natural Unexpected Events and Sites > Office?: +33 1 58 35 88 84 > > ______________________________________________ > R-devel at r-project.org mailing list > https://stat.ethz.ch/mailman/li...