similar to: randomForest Tutorial

I have two vectors x and y, which I would like to plot against each other. I am also displaying other data in this plot. However, I have about 1 million points to plot, and just plotting them x againt y is not very informative. What I'd like to do is to do sort of a continuous box plot. My x values goes from -1 to 1 and my y values from 0 to 1, so I?d like to plot the median and quantiles,

hello, I want to use randomForest to classify a matrix which is 331030?42,the last column is class signal.I use ? Memebers.rf<-randomForest(class~.,data=Memebers,proximity=TRUE,mtry=6,ntree=200) which told me" the error is matrix(0,n,n) set too elements" then I use: Memebers.rf<-randomForest(class~.,data=Memebers,importance=TRUE,proximity=TRUE) which told me"the error is

Hello there, I am working on an extremely unbalanced two class classification problems. I wanna use "classwt" with "down sampling" together. By checking the rfNews() in R, it looks that classwt is not working yet. Then I looked at the software from Salford. I did not find the down sampling option. I am wondering if you have any experience to deal with this problem. Do you

Hi All, Sorry if this is a repost (a quick browse didn't give me the answer). I wonder if there are packages that can do the feature selection and classification at the same time. For instance, I am using SVM to classify my samples, but it's easy to get overfitted if using all of the features. Thus, it is necessary to select "good" features to build an optimum hyperplane (?).

We are considering setting up a fast, RAM loaded machine as an "R-server" to handle the big problems not suitable for individual desktops and, also, to process ad hoc analysis requests via our portal. We are 99% a Windows shop, so first choice is a windows server. We'll use (D)COM for the portal interface and understand that. What has me stumped is how to easily interface

Hi, I am trying to print out my confusion matrix after having created my random forest. I have put in this command: fit<-randomForest(MMS_ENABLED_HANDSET~.,data=dat,ntree=500,mtry=14, na.action=na.omit,confusion=TRUE) but I can't get it to give me the confusion matrix, anyone know how this works? Thansk! Ruben [[alternative HTML version deleted]]

Dear all I tried finding a package for event studies but unfortunately without success. Does anyone know which package suits best for such an analysis? Thank you in advance. Regards [[alternative HTML version deleted]]

Hello R Helpers, Before setting up a connection with RODBC, I would like to present my users with a pick list of ODBC data sources available in their environment. I may be missing something, but don't see anything in RODBC itself to return list of sources for use in select.list(). Any hints? I'm running 2.3.0 on Win XP SP2. -- TIA, Jim Porzak Loyalty Matrix Inc. San Francisco, CA

Max & Friends, I've run into a problem with odfWeave 0.7.5 running under R 2.7.1 (Windows XP, SP2) doing some monthly production reports. Under 2.7.1 I'm getting various parsing errors after Sweaving starts, e.g.: Sweaving content.Rnw Writing to file content_1.xml Processing code chunks ... Error in parse(text = cmd) : unexpected input in "" > Above case works

Dear List I am new to R and to the list and will try best as I can be clear and concise. My apologies if anything I write contravenes the posting code on this list. I would also like to say I have run through most of the material on the R website before writing this email however, I am stuck. Here is what I want to do and what I have done 1. Read a comma seperated text file into R I have used

HI, We currently have Samba version 3.0.7 based on HP CIFS Server A.02.01.02, and our O/S is HP/UX 11i (version 1). We are upgrading our Domain controller to a windows 2008 server. However, when we try to join to the server 2008, we are unable to authenticate with the Windows 2008 server. I have attached the message I am receiving. HP has told us we need to upgrade which involves not

Friends, I have a POSIXct vector "located" in EST timezone. When I plot against it here in PST, the time axis is shifted 3 hours back in time. IOW, plot adjusts for time zone difference. Now that's really great, if that's what one wants. However, I want time axis to use actual times in object (without any shift). For example: n <- 360 y <- rnorm(n) t <- seq(from =

I'm not understanding something. I'm trying to add xlab & ylab to a balloon plot of a table object. From docs I thought following should work: require(gplots) # From balloonplot example: # Create an example using table xnames <- sample( letters[1:3], 50, replace=2) ynames <- sample( 1:5, 50, replace=2) tab <- table(xnames, ynames) balloonplot(tab)

All, Tuesday week (July 15th) Mike Driscoll & I will be presenting "A Gentle Introduction to R and its Applications in Business Intelligence" at the SDForum Business Intelligence SIG in Palo Alto, California. One motivation is to judge interest in starting a Use R Group in the Bay Area. We will have an informal organizational meeting after the talk. We hope all local R

Hi R folks, I'd like to announce several new R users groups here in SF, LA, NYC, and Ottawa - as well as their next scheduled event. The goal of these user groups, besides gently explaining 'drop=TRUE' to the uninitiated, is to exchange knowledge, promote best practices, and spur the adoption of R for innovative applications. If I've missed any groups here, please feel to add on

Within an R dataset, I have a date field called “date_”. (The dates are in the format “YYYY-MM-DD”, e.g. “1995-12-01”.) How can I add or subtract “1 month” from this date, to get “1996-01-01” or “ “1995-11-01”. --------------------------------- [[alternative HTML version deleted]]

Dear Lister, Is there an interface in R with SQL server that allows me to append records to table in the DB? Might I do that using RODBC? Thanks a lot. -- WenSui Liu A lousy statistician who happens to know a little programming (http://spaces.msn.com/statcompute/blog)

I have a client running Microsoft SQL Server. I am interested in ways of accessing data from this server using R. I would welcome any information about how this can be done. I have a reasonable grasp of SQL and have experience with MySQL and RODBC but don't know anything much about Microsoft SQL Server. David Scott -- _________________________________________________________________

Hi Sorry for such an inane question - how do I control the order in which the boxes are plotted using boxplot() when I pass it a formula and a data.frame? It seems that the groups are plotted in alphabetical order... I want to change this.... Many thanks Mick

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