search for: sciteg

Hi there - Is there a way to write statistical models (trees, naïve Bayes, SVM, etc) to a file and import them again without loss of information? Thanks - Ton Ton van Daelen, PhD Director, Application Support Tel: (858) 279-8800 ext 217 Fax: (858) 279-8804 Web: www.scitegic.com Register now for the 2004 Pipeline Pilot user group meeting Jan 28-30 in San Diego: http://www.scitegic.com/UGMSD2004/ [[alternative HTML version deleted]]

...efault(x[[i]], optional = TRUE) : can't coerce array into a data.frame Can anyone tell me what the most convenient/flexible way is to write data.frames? Thanks - Ton Ton van Daelen, PhD Director, Application Support Tel: (858) 279-8800 ext 217 Fax: (858) 279-8804 Web: www.scitegic.com SciTegic Inc. - ask more of your data [[alternative HTML version deleted]]

Hello all, Sorry for this email not directly related to R developement. I just come from a nice demonstration session from Scitegic about their Pipeline Pilot (PP) software, and especially their 'R collection' which brings R calculations into the software (http://www.scitegic.com/documents/RStats_Collection.pdf). I looked carefully on the way they do it: they pass data from PP to R using text files, they call R.e...

I'm looking for an efficient way of removing zero-variance columns from a large matrix. Any suggestions? Thanks, - Moises [[alternative HTML version deleted]]

I'm using the following command to run R in Windows "Rterm --no-save --no-restore < "Rscriptfile" > "Rstdoutfile" How can I capture the text sent by R to stderr in a file? Thanks, - Moises [[alternative HTML version deleted]]

I'm trying to install the VR package for version 1.9.1 but I'm getting the following error message: > install.packages("VR") trying URL `http://cran.r-project.org/bin/windows/contrib/1.9/PACKAGES' Content type `text/plain; charset=iso-8859-1' length 20716 bytes opened URL downloaded 20Kb trying URL

...false. GetLastError = 50 Error message = "The network request is not supported." We have a samba drive at our facility where this works fine and other customers have not experienced this problem. Any idea what may be the problem? Thanks for any help! Steve Bush -- Steven Bush (sbjobs@scitegic.com)

What's the preferred way in R for handling samples with binary data (like chemical fingerprints encoded as hexadecimal strings with 0's and 1's indicating the absence or presence of chemical features) in methods such as clustering and MDS. Do you always have to expand the fingerprint data into individual variables (which can be a few hundreds) or can they be used directly as binary

Hi all - (Re my previous question to the list, I managed to generate an ROC plot for my SVM by ranking the data using the Decision.Values property. Thanks for your responses) I have now started tuning the SVM to get optimal parameters for the RBF kernel and I ran into a problem. Whatever parameter ranges I specify, I always get the same error values for all combinations of parameters it

Is there an easy way of converting an aov.summary into a matrix in which the rows are the factor names and the columns are Df, Sum Sq, Mean Sq, F value and Pr. For example, convert Df Sum Sq Mean Sq F value Pr(>F) block 5 343.29 68.66 4.4467 0.015939 * N 1 189.28 189.28 12.2587 0.004372 ** P 1 8.40 8.40 0.5441 0.474904 K

Hi all - I am trying to tune an SVM model by optimizing the cross-validation accuracy. Maximizing this value doesn't necessarily seem to minimize the number of misclassifications. Can anyone tell me how the cross-validation accuracy is defined? In the output below, for example, cross-validation accuracy is 92.2%, while the number of correctly classified samples is (1476+170)/(1476+170+4) =