similar to: how to control the sampling to make each sample unique

Dear R-helpers, I would appreicate if someone can help me on the transfer parameter in ARIMAX and also see what I am doing is correct. I am using ARIMAX with 2 Exogeneous Variables and 10 years data are as follows: DepVar Period, depVar, IndepVar1 Period, indepVar1, IndepVar2 Period, indepVar2 Jan 1998,708,Jan 1998,495,Jan 1998,245.490 Feb 1998,670,Feb 1998,421.25,Feb 1998,288.170 Mar

Dear All, I am far from being a guru about parallel programming. Most of the time, I rely or randomForest for data mining large datasets. I would like to give a try also to the gradient boosted methods in GBM, but I have a need for parallelization. I normally rely on gbm.fit for speed reasons, and I usually call it this way gbm_model <- gbm.fit(trainRF,prices_train, offset = NULL, misc =

Hi R User, I was trying to find a final model in the following example by using the Boosted regression trees (GBM). The program gives the fitted values but I wanted to calculate the fitted value by hand to understand in depth. Would you give moe some hints on what is the final model for this example? Thanks KG ------- The following script I used #----------------------- library(dismo)

Hello, Gurus: I tried to test if the sample mean of a dataset is zero. The data has 1500 numbers with a lot of zeros and some small positive numbers. The data range on [0,1] but the distribution is unknown. It is zero inflated anyway. I tried to use the Wilcoxon Signed Ranks test. But I read from this website that it does assume the population pdf is symmetric.

> From: luk > > I got the following results when I run radomForest with below > commands: > > qair <- read.table("train10.dat", header = T) > oz.rf <- randomForest(LESION ~ ., data = qair, ntree = 220, > importance = TRUE) > print(oz.rf) > > Call: > randomForest.formula(x = LESION ~ ., data = qair, ntree = > 220, importance =

I am trying to call a C++ k-means function within R and I am struggling. I know that the below code is used to call a C++ function for gbm but how do I do it for k-means? gbm.obj <- .Call("gbm", Y=as.double(y), Offset=as.double(offset), X=as.double(x), X.order=as.integer(x.order),

Hello! I am trying to use lm to do a simple regression but on a batch of different files. Each file has different column names. I know the first column is the dependent variable and all the rest are explanatory variables. The column names are in the first line of the file. But it seems lm() requires I know the variable names in advance? Is there a way to dynamically read in variable names

Hi I have the following factor of dates that I want to converted to Date class so I can extract the month > test.date [1] 14/05/2012 14/05/2012 14/05/2012 14/05/2012 14/05/2012 14/05/2012 [7] 14/05/2012 14/05/2012 14/05/2012 14/05/2012 201 Levels: 01/10/2012 01/11/2012 01/12/2012 02/07/2012 ... 28/09/2012 I use code below ntest.date<-as.Date(test.date,'%d/%m/%y') but the output

We will be connecting our Asterisk server to ISDN 30 and intend using the Sangoma A101 card. The install location is in London (UK). Sangoma card at Voipon http://www.voipon.co.uk/sangoma-a101-pri-isdn-card-p-132.html?gclid=CI32vJz22I0CFQXklAodIgjHaA I would be grateful to hear if this is the right choice of card. Usage reports would be helpful. Regards Rory -- Rory Campbell-Lange

well i've tried everything trying to get r/w access to my linux box (debian 2.2.3 running samba 2.0.7) from win2k. can only get readonly. i'm hoping some kind sould might be able to take a look at my samba config and let me know what i'm doing wrong... # Samba config file created using SWAT # from localhost (127.0.0.1) # Date: 2001/11/01 00:39:30 # Global parameters [global]

Dear folks-- The function below is a snippet of a larger function that is not doing what it is supposed to do, and I do not understand its behavior. The larger function is supposed to produce an array containing the results of a user-specified function applied to groups of data defined by the intersection of one or more factors, and return them in an array with a dimension for each factor and a

Dear list: Thanks a lot for help. I have a question and I could not find clear answers easily. When we do logistic regression for one type of events of interest as a proportion of a broader types of events, does the logistic regression assume that the number of whole types of events should be independent with the number of type of interest? For example, if one type of events and the whole type

Hello everybody, I'm testing the randomForest package in order to do some simulations and I get some trouble with the prediction of new values. The random forest computation is fine but each time I try to predict values with the newly created object, I get an error message. I thought I was because NA values in the dataframe, but I cleaned them and still got the same error. What am I

Hi all If I have a string, say "ABCDA", and I want to convert this to the sum of the letter values, e.g. A -> 1 B -> 2 etc, so "ABCDA" = 1+2+3+4+1 = 11 Is there an elegant way to do this? Trying something like which(LETTERS %in% unlist(strsplit("ABCDA", ""))) is not quite correct, as it does not count repeated characters. I guess what I need is

I have done a read.table on a data file with the aim of extracting subsets of the data eg table[table$desc = 'result1',] How can I convert $desc to a character type? At present it is seen by typeof() as an integer. How can I do the equivalent of table[table$desc = 'result1' && table$amt > 20, ] Thanks, Rory -- Rory Campbell-Lange <rory at

Hi all Does anyone know if it is possible when plotting a line or scatter plot, to selectively color the data points based on the data value? i.e. if plotting say the percentage change in stock price movements, to color +ve points in green and -ve points in red? And extending this to a user-defined range of colors based on the quartile of the data points? Thanks Rory Rory Winston RBS Global

Hi (If you're wondering, this is a Project Euler question :)) If I wanted to calculate the sum of the digits in the decimal representation of 2^1000, what would be a good way to go about that? I've tried the following methods: # Calculate the sum of digits in the decimal representation of 2^n # Only works for smaller values of n bsum <- function(n) { s <- 0 e <-

Hi Using Apple Mail I cannot make subdirectories within new directories I have made on a Debian Dovecot-driven IMAP server (version 0.99.11-3). Some users, having used Exchange, expect to be able to do this. However I can't make it happen, even after doing some tests by chmod-ing the top-level directories to 777 and enabling the mail_full_filesystem_access = yes option on a test

We are intending to have some project mail accounts which many people (up to 10) will share. Will this work? Our configuration uses imap only, with maildir format mail storage. Thanks Rory -- Rory Campbell-Lange <rory at campbell-lange.net> <www.campbell-lange.net>

Hi! I'm looking forward to deploying dovecot as an IMAP server. I did some research into the various options and it looks like dovecot is the right daemon for me. I'll be using it with Exim. I am running a few tens of users on my server, most of them small numbers of people part of a small company, e.g. example.com. At present I have exim delivering to mbox in each virtual user's