similar to: accessing information in data.frame

Is there a statistical test implemented within R to compare the area under two ROC curves ?? Thanks, Berthold -------------- next part -------------- A non-text attachment was scrubbed... Name: berthold.kramm.vcf Type: text/x-vcard Size: 214 bytes Desc: Card for Dr. Berthold Kramm Url : https://stat.ethz.ch/pipermail/r-help/attachments/20011120/dc0f7bf1/berthold.kramm.vcf

Hi, is there a possibility using the step() function together with a glm() model, to force keeping some of the covariates in the model ?? and not having them dropped ?? Thanks, Berthold -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or

I am using stepAIC for stepwise regression modeling. Is there a way to change the entry and exit alpha levels for the stepwise regression using stepAIC ? Many thanks, Berthold Berthold Stegemann Bakken Research Center Maastricht The Netherlands [[alternative HTML version deleted]]

Hello, I am using the maps library for plotting maps. To build new geograhical sets such as Europe I use europe = c('Germany','Netherlands',...) Is there a list of county codes used by the map function. Thanks, Berthold -- Berthold Stegemann Brunssumstrasse 21a 52074 Aachen Germany Tel: +49 241 401 8909 Mobile: +31 6 2041 4824

In an experimental setup we obtain z-data samples at equidistant grid points. The surf.gls (Kriging) algorithm produces an error under this circumstance when performing the Choleski decomposition. A workaround is to dither the grid coordinates using (x <- rnorm(length(x)) ; y<- rnowm(length(y))). Question: Is this an expected behaviour of the surf.gls function ? Regards, Berthold

Hello! I like to PXE boot the 'Dell 32 Bit Diagnostics' tool. I can create a harddisk image with the linux download package. The README of the Package gives an example how to create an memdisk entry for the pxelinux menu system: <quote> Create a Bootable HDD Image File Use of the resulting image to perform a Preboot Execution Environment (PXE) boot into the diagnostics

It?s sometimes faster to ask from someone who has already learnt the syntax. In this case one has to do e.g. names(data$somecol) To get the collection and then iteration through it is almost like in Python: for(i in names(data$somecol)) { # do something } > Bert Gunter <bgunter.4567 at gmail.com> kirjoitti 6.11.2017 kello 19.55: > > Time to go through a tutorial or two! --

Matti - Since you are asking about looping through a column, not looping across columns, it is simply the following: # Note: data.frame() turns strings into factors by default. myDF <- data.frame(type = c("a", "j", "a", "a", "j"), weight = c(12.3, 6.8, 10.5, NA, "5.5")) myDF$type # ... is a vector of factors

Hello, If you want to loop through the columns of a data.frame you can do for(i in names(df)){ [code] } Another way would be lapply(names(df), function(somecol) class(df[[somecol]])) where class(df[[somecol]]) is just an example, you would use whatever fits your needs. When you say that the column in question holds "levels" do you mean it's a factor? (factors are R's

Boris: "As others have remarked, for added efficiency with large datasets we often use functions from the apply() family, rather than for-loops." That is generally false, though it is a common misconception. Apply-type functions are used to maintain fidelity -- and for some, clarity -- to a functional programming paradigm. Cheers, Bert Bert Gunter "The trouble with having an

I don't use SPSS but following through on your detective work can provide the likely answer. First note that both date numbers are evenly divisible by the number of seconds in a day, i.e. 24*60*60. This suggests that these numbers are seconds since some origin. Since we know "2003/02/11" corresponds to 13264300800 we deduce that the origin must be spss.orig <-

Hi, It seems that setting a with_scope on the parent class doesn''t do anything MyClass.with_scope(:find=>{:conditions=> ["somecol = ?", ''val'']}) do @ext_pages, @ext_rows = paginate :my_extended_class, { :per_page => 13 } end # this doesn''t generate WHERE somecol=''val'' In order for scope to work you have to call

Time to go through a tutorial or two! -- This forum cannot replace such self study. Your query evidences some basic confusion, but ?tapply or the equivalent lapply(split(...)) construct are most likely relevant. Cheers, Bert Bert Gunter "The trouble with having an open mind is that people keep coming along and sticking things into it." -- Opus (aka Berkeley Breathed in his

I'm using R 2.8.1 on Ubuntu 8.10. I'm writing partly to ask what's wrong, partly to tell other users who search that there is a work around. The General Social Survey is a long standing series of surveys provided by NORC (National Opinion Research Center). I have downloaded some years of the survey data in SPSS format (here's the site:

A couple of months ago, probably using an older version of R, R used to run the following code just fine: library("foreign") data.exp1 <- as.data.frame(read.spss("dataDef.sav")) Issuing the same commands now (after starting R using --vanilla), gives me the following behavior: > library("foreign") > x <- read.spss("dataDef.sav") Error

Full_Name: Roger Newton Version: 2.8.1 OS: windows 2000 Submission from: (NULL) (80.176.228.157) I have an elderly version of SPSS (version 11) which I still use. R Version 2.6.1 would, and still will, read SPSS *.sav files produced by SPSS version 11. R version 2.8.1 which I installed two days ago (05/02/09) reports an error and shuts down when trying to read SPSS version 11 *.sav files using

I can't seem to figure out why I'm getting this error. The output is copied right off the screen. Notice how in some cases the back slash is missing. In other cases, it can't read a file that I know is there. Thanks in advance > library(foreign) > hrout <- read.spss("c:\\hrab200.sav") Error in read.spss("c:\\hrab200.sav") : unable to open file

SPSS seems to have changed its default datafile format, resulting in issues for read.spss(). In Windows this results in a warning, in Debian the import completely fails: Debian (R version 2.8.0 (2008-10-20) i486-pc-linux-gnu, foreign_0.8-29) > read.spss("/home/jeroen/samples/Tomato.sav") Error in iconv(names(rval), cp, "") : unsupported conversion from 'CP65001'

Hola, Tengo problemas a la hora de cargar un archivo que originalmente está en SPSS. Trabajo con Fedora y uso R mediante el plugin Rgedit en gedit. Además en Fedora no tengo SPSS, sino PSPP Para cargar el archivo he probado estas dos cosas (escribo también el mensaje de error que me genera R): >library_(foreign) >read.spss("guille.sav",to.data.frame = T) Error en

Full_Name: Frank Harrell Version: 1.6.1 OS: RedHat 8.0 Linux Submission from: (NULL) (128.143.108.90) I get an error when trying to load a URL that contains a file that was saved using save(object, compress=TRUE): > load('http://hesweb1.med.virginia.edu/biostat/s/data/sav/kprats.sav') Error in gzfile(file, "rb") : unable to open connection In addition: Warning message: