similar to: rpart unbalanced data

Friends, I have noticed that many publications that use RF report variable importance as a function of mean decrease in accuracy rather than mean decrease in gini. Am I correct that the mean decrease in accuracy is just the mean decrease in gini divided by 100? Thanks, Helen Mills Poulos Yale School of Forestry

All, What purpose does the getTree function have in Random Forest? Can you graph it as you can in rpart and can it be interpreted in the same way? Helen Mills Poulos Yale School of Forestry

I have a vague recollection of seeing a R-function that will output a table or matix in a format suitable for the tabular enviroment in LaTeX. But I cannot find it. Any hints? Bendix ---------------------- Bendix Carstensen Senior Statistician Steno Diabetes Centre Niels Steensens Vej 2 DK-2820 Gentofte Denmark tel: +45 44 43 87 38 mob: +45 28 25 87 38 fax: +45 44 43 73 13 bxc at novo.dk

Howdy! Could somebody point me to some good introductory readings about data mining and descriptive data analysis? I'm a psychologist and a couple of times I realized that some things just don't appear in psychological literature, e.g. I've never seen a box plot anywhere in psych journals so I'm not familiar with them. The R help function is great when it comes to explaining

When I read a table (the dimnames of the table are numbers), R reads the column names as: X plus the number (X1,X2,X3,...) and the rownames as the numbers (1,2,3,...) How can I suppress this action? The code and the output: ^^^^^^^^^^^^^^^^^^^^^^^^ > r2<-read.table("h:\\matrix",header=T,dec=",",na.strings="-99") > dimnames(r2) [[1]] [1] "500"

I'm using R to manipulate some data for testing nebulisers. I have a data frame as follows: Volt ABal 0.4208 A1 0.3982 AF 0.4353 B1 0.3954 BF 0.4355 C1 0.3975 CF 0.4345 I also have a calibration curve loaded Voltage NaF LogNaF 1 0.3588 20 1.30103 2 0.3990 100 2.00000 3 0.4391 500 2.69897 If I try to

Hi, i have some problems to get means, but the data have got NA's which should not be replaced or delete ! tapply(data,var,mean) # makes me problem,because when one value is NA mean is NA,too. Another attempt is this, because the summary does what i want , but is not subsetable to summary[4] if i use tapply,table and the the function below gives me again all means as NA ? xmean

hi listees- Running windows 2000 and r 0.99 or 1.00; I get different lines on screen and print out: > j<-read.table("jnk.rin",head=T,sep="\t") > attach(j) > #gives lines I want > qqnorm(Dog,pch="o",main="Cumulative Frequency Log Dog Size",log="y",sub="Figure 2",x =c(-3,3),ylim=c(2000,1000000)) >

Rather than spend a tedious interactive session picking several (in fact most) of the library packages off the CRAN site one by one, it would be handy to be able to grab the lot in one go (they seem to add up to about 24MB, so it's not a huge download). Is there a way to do this? Thanks for the help. Ted. -------------------------------------------------------------------- E-Mail: (Ted

Hi! I am looking for a R library by which i can load images (i found pixmap that allows it to do). But in addition i need methods to access the data, get them for example as an array or matrix to do with this data some processing. 1. Is there a method in the pixmap library to access the matrix in which the image data is stored. 2. Is there an alternative library running under MS Windows?

Hi everybody, I want to download the spatial library but I don't find it at the CRAN list package. Where can I find the package ? I have to download it to use the function correlogram. Thanks in advance, Paola. -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info",

Dear R-user, I wish to know if someone is using R as concern Datamining or KDD (Knowledge Discovery in Database) and if already exists a R package specialized in this kind of analysis. I found this contributes on the R web site: [20] Diego Kuonen. Introduction au data mining avec R : vers la reconqu??te du `knowledge discovery in databases' par les statisticiens. Bulletin of the Swiss

Dear all there's something. that puzzles me about what R is :-) "R is available as Free Software under the terms of the Free Software Foundation's GNU General Public License in source code form." (Source: http://www.r-project.org/about.html) But, looking at the second paragraph of the same site, you see this: "... and R provides an Open Source route to

Dear all there's something. that puzzles me about what R is :-) "R is available as Free Software under the terms of the Free Software Foundation's GNU General Public License in source code form." (Source: http://www.r-project.org/about.html) But, looking at the second paragraph of the same site, you see this: "... and R provides an Open Source route to

Hello Spse I have a matrix, say 1 2 3 4 5 6 7 8 9 and I would like to expand it by repeating rows within the matrix, to get, if the repeating factor is 2, say: 123 123 456 456 789 789 (or columnwise as well) . There must be a smart way of doing that? Many thanks Juhana Vartiainen juhana.vartiainen at labour.fi -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-

Good day: Let's say that I have a data frame in S-Plus 2000 (Win98 version). I want to use the same data frame with R on another computer. Questions: 1) Can R read S-Plus data frames? Can S-Plus 2000 read R data frames? 2) How can i move the data frame between the two systems? Do I need to use dump()? Thank you.

Does R have a bootstrap command like SPlus, or do we have to form our own code if we want to do bootstrapping in R? Jason Parcon Western Michigan University e-mail addresses: s0parcon at wmich.edu parcon at stat.wmich.edu -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read

I was wondering if R had a data mining componant and how i could get it. If not do you know anyone who is developing a datamining "plug in" for R Phillip Goodreid -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe"

HI All, I am trying to analyse the results of a heap of samples, to determine how many samples are required to meet a defined confidence interval. I checked out the R manual for bootstrapping and re-sampling methods, but did not find anything. Are there any contributed procedures that deal with this? thanks, Matt Redding Soil Scientist Intensive Livestock Environmental Management-Research

R people, I need to know if is possible to make data mining with R. If so, is there any manual or somewhere/one to consult about that. Thank you very much Adri?n