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Hi all, I am trying to play around with the randomForest function for classification. I know its performance is great. I am currently using the default options. It has many options. How do I further tweak the options so that I can make its performance even better? What are the options that are mostly used? Thanks a lot! M [[alternative HTML version deleted]]

Hi all, I am looking for recommendations/pointers about best report generator you think that are currently available? i.e. the package that can help turn console output into nice-looking neat report to send to bosses? thanks a lot! [[alternative HTML version deleted]]

Hi all, What parameter do I normally change in the rpart function? How do I set the "cp" option? Is there a way to read off error rate directly from the "rpart" function for training data; I imagine for testing data I have to apply a "predict", but for training data I guess the error count would be somewhere existing once the "rpart" function is

On Sun, May 27, 2012 at 11:32 AM, Michael <comtech.usa@gmail.com> wrote: > Help! The R Console very quietly closed and exited without giving any > errors/warnings...after I loaded the RODBC library... > > Loading required package: RODBC > > > > > On Sat, May 26, 2012 at 10:27 PM, Michael <comtech.usa@gmail.com>...

Is there a data/variable explorer in R? Hi all, I am inspecting a complex variable which has lists inside lists... Is there a data-explorer that can help me view the structure and content of such variables? Thank you! [[alternative HTML version deleted]]

head, tail and fix commands don't really work well if I have large matrix/array for which I would like to be able to scroll up and dow, left and right ... Could anybody please help me? Thanks [[alternative HTML version deleted]]

Hi all, I tended to use rbind, or cbind to force a vector be be deemed as a column or row vector. This is very important if I want to do things like u' * A * u, where u' is a row vector and u is a column vector, regardless of what originall format the "u" is... I want to recast it to column vector or row vector... How can I do that?

Hi all, I am using "locator" to select the points from a scatter plot... This is all fine. But the problem is that the locator only returns the axis values of the selected points. Instead, I would like to get the index of these select points... The axis values are real-values so it's a bit hard for me to directly reverse-engineer the index nubmers.. How to do that? Thank you!

Sender: r-help-bounces at r-project.org On-Behalf-Of: comtech.usa at gmail.com Subject: Re: [R] [R-SIG-Finance] forecasting earnings, sales and gross margin of a company... Message-Id: <b1f16d9d0810231239k506d582i7ecb908b84bc1642 at mail.gmail.com> Recipient: ngottlieb at marinercapital.com -------------------------------------------------------- Thi...

Hi all, Could anybody please recommend some hands-on books on classification, data-mining and machine learning with R? I would like to get a very good understanding of the statistical tools that are used in these areas, while reducing the learning curve. Thank you!

Hi all, After trial and error by myself for a few hours, I decide to ask for your help. I have a training set which is a matrix of size 200 x 2, where the two columns denote each independent variable. I have 200 observations. ----------------- ss=data.frame(trainingSet); result=lm(trainingClass~ss$X1+ss$X2); ----------------- where trainingClass denotes the true classes of the training data.

Hi all, I am using the "svm" command in the e1071 package. Does it have an automatic way of setting the "cost" parameter? I changed a few values for the "cost" parameter but I hope there is a systematic way of obtaining the best "cost" value. I noticed that there is a "cross" (Cross validation) parameter in the "svm" function. But I

...guage boot(data = x, statistic = myMean, R = 10) $ stype : chr "i" $ strata : num [1:10] 1 1 1 1 1 1 1 1 1 1 $ weights : num [1:10] 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 - attr(*, "class")= chr "boot" Andy -----Original Message----- From: Michael [mailto:comtech.usa@gmail.com] Sent: Thursday, April 20, 2006 12:19 PM To: Liaw, Andy Cc: R-help@stat.math.ethz.ch Subject: Re: [R] Bootstrap error message: Error in statistic(data, origina l, ...) : unused argument(s) ( ...) [Broadcast] btw, if you change "myFun" to any R internal function, such as &...

Currently I have to convert all my "xls" into "csv" before I can read it in and process the excel data in R... Is there a way to directly read in "xls" data? Thanks a lot! [[alternative HTML version deleted]]

Using forecast package. http://www-personal.buseco.monash.edu.au/~hyndman/Rlibrary/forecast/ Best Regards. Message: 50 Date: Thu, 18 May 2006 18:50:15 -0400 From: "Wensui Liu" <liuwensui en gmail.com> Subject: To: Michael <comtech.usa en gmail.com> Cc: R-help en stat.math.ethz.ch Message-ID: <1115a2b00605181550i1e718124p3ec01f4f70ed9f02 en mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed what is your criterion of 'best arima'? there are more than 1 criterion for 'best' m...

Hi all, Could you please give me some pointers about what's the best boosting package in R currently? in terms of classification accuracy? And any pointers about tutorials and study-materials to curb the learning curve will be greatly appreciated! Thank you! p.s. Does anybody happen to know Boosting implemented in other language such as Matlab? Are they good in terms of accuracy? What

Hi all, How could I set a timer in R, so that at fixed interval, the R program will invoke some other functions to run some tasks? Thank you very much!

Say a matrix of size of thousands? I am looking for an eigen-value decomposition algo in R to give good eigenvalues... Is that a hopeful thing? Thank you! [[alternative HTML version deleted]]

Hi all, I have a newbie question: If I have a function with the following documentation: ca.jo(x, type = c("eigen", "trace"), ecdet = c("none", "const", "trend"), K = 2, spec=c("longrun", "transitory"), season = NULL, dumvar = NULL) Let's take "type" as an example... if I omit this parameter when calling the

Hi all, Could you please point me to good materials on various tricks/intuitions/techniques of regression, and hopefully in R? For example, what does lm(y~ x * w - 1) mean vs. lm(y ~ x/w -1 ) vs. lm (y ~ x:w-1), etc... I just found that even simple linear regression is not that simple and there are a lot of tricks/techniques in using them... Hopefully I can find good materials on these! Thank