[R] Noobie question on aggregate tapply and by

I have a 43MB dataframe ( 5 variables) and I'm trying to summarize subsets of the data. I've RTFM ( not very clear) and looked at a variety of samples but cant seem to figure out how to make these functions work. A sample of what I want to do would be this: ids-seq(1,50)

Re: [R] Noobie question on aggregate tapply and by

Here is one solution for your question: mean.data - with(DF, tapply(data, years, mean, na.rm = T)) mean.data2 - with(DF, tapply(data2, years, mean, na.rm = T)) cbind(mean.data , mean.data2) Another one would be for you to read about the package plyr (which is better for this job, actually) And

Re: [R] how to import a dataframe with mixed text and numbers

I would try using something like read.table with read.table(..., sep = ---) And then clean the variables one by one (you'll need to search the mailing list for help on time variables. And also for ways to search and replace text - all exist as answers here)

Re: [R] Noobie question on aggregate tapply and by

Thanks I'll try that, still need to understand how the other functions work.. just to satisfy myself..thanks again On Sun, Apr 25, 2010 at 12:06 AM, Tal Galili tal.gal...@gmail.com wrote: Here is one solution for your question: mean.data - with(DF, tapply(data, years, mean, na.rm = T))

Re: [R] StatEt: Error R Object Browser Update java.lang.NullPointerException

Have you managed to resolve this? I get the same error on Karmic Koala as well. -- View this message in context: http://r.789695.n4.nabble.com/StatEt-Error-R-Object-Browser-Update-java-lang-NullPointerException-tp1591264p2064072.html Sent from the R help mailing list archive at Nabble.com.

Re: [R] Formatting numerical output

MARCEL CURLIN wrote: . Currently my output looks like: [1] Excluded range: Time 00.2 [4] R^2 =0.111526872884505 [1] Excluded range: Time 0.2 0.4 [4] R^2 =0.0706332920267015

[R] How to assign scores to rows based on column values

Hi, I'm trying to assign a score to each row which allow me to identify which rows differ. In the example file below, I've used , to indicate column separators. In this example, I'd like to identify that row 1 and row 5 are the same, and row 2 and row 4 are teh same. Any help much appreciated.

Re: [R] 2 simple question

On 04/25/2010 06:27 AM, tamas barjak wrote: Hi I do not speak in English very well, I'm sorry. I try good: layout(matrix(1:4,ncol=2, byrow=T)) = par(mfrow=c(2, 2)) plot(1,1)--- anddoes plot in the upper left corner plot(2, 2)--- upper right corner BUT, I like plot( n, m) for example lower

Re: [R] StatEt: Error R Object Browser Update java.lang.NullPointerException

Hi Roman, Roman Luštrik wrote: Have you managed to resolve this? I get the same error on Karmic Koala as well. Are you sure you're using the latest StatET, i.e. version 0.8.2, installed from the update site (for Eclipse 3.5) at http://download.walware.de/eclipse-3.5 Best, Tobias

[R] method dispatching vs inheritance/polymorphism (re-post)

Hi, I'm having trouble seeing the added value over functions defined by setGeneric vis-a-vis methods defined by inheritance and polymorphism. setGeneric offers a 'clean' call to a generic function, ie. no need to call new(), so less typing to do for the user. But such explicit calls can also

Re: [R] method dispatching vs inheritance/polymorphism (re-post)

On 25/04/2010 9:07 AM, Albert-Jan Roskam wrote: Hi, I'm having trouble seeing the added value over functions defined by setGeneric vis-a-vis methods defined by inheritance and polymorphism. setGeneric offers a 'clean' call to a generic function, ie. no need to call new(), so less typing to do

[R] Struggling with two questions : Newbie student .

Hi , I am struggling with these two question . Any help would be appreciated ,Im looking at doing them on r ? 1. Tests for indications of asbestos in the lungs of employees at an insulation manufacturer resulted in four persons with positive indications of asbestos being sent to a medical center

Re: [R] StatEt: Error R Object Browser Update java.lang.NullPointerException

I have previously just extracted the eclipse archive to a folder and ran eclipse. What might have happened is that not all dependencies must not have been met. I have just installed Eclipse with apt-get and everything seems to be working in order. On Sun, Apr 25, 2010 at 1:58 PM, Tobias Verbeke

Re: [R] How to assign scores to rows based on column values

On Apr 25, 2010, at 1:08 AM, burgundy wrote: Hi, I'm trying to assign a score to each row which allow me to identify which rows differ. In the example file below, I've used , to indicate column separators. In this example, I'd like to identify that row 1 and row 5 are the same, and

[R] randomForest predictions with new data

Hi I am new to R, randomForest and I have read about how to use it in your old mails. I have also run the predictions examples from CRAN. But I still don't understand how to use it right. The thing that I don't understand is how to run the result from the randomForest on one line (post)

Re: [R] Struggling with two questions : Newbie student .

malcolm Crouch malcolm.croucher at gmail.com writes: 1. Tests for indications of asbestos in the lungs of employees at an insulation manufacturer resulted in four persons with positive indications of asbestos being sent to a medical center for further testing . if 45% of the employees have

Re: [R] categorical variable in scatterplot (car)

Dear Peter and Anthony, Thanks, Peter, for answering the question, but scatterplot() should work even if z is not a factor, and does for me in the following example: library(car) Prestige$tp - with(Prestige, ifelse(type == prof, 1, 0)) scatterplot(prestige ~ income | tp, data=Prestige) So,

Re: [R] Intersection for two curves

quote Many people seem to be reluctant to define functions, even thought I think it is a pretty small step from writing scripts to writing functions. I'm not so sure - I find most students struggle to grasp that next level of abstraction. Generalising from a specific task to a general

Re: [R] basic table statistics

I presume you want to use such tables to summarize baseline information (a.k.a Table 1 in medical papers) Try the Hmisc package ... will do the tables and statistics for you and save them as tex (which you can import directly into in your favorite Office like program after running htlatex)

[R] Manipulating text files

Dear R Community, I am trying to optimize a water quality model that I am using. Based on conversations with others more familiar with what I am doing I plan to implement DEOptim to do this. The water quality model is interfaced through a GUI. I have the input file necessary to alter

Re: [R] Manipulating text files

Try this. First we read in the lines using readLines. (We use textConnection here to keep it self contained but you can read it from the file as shown in the commented out portion.) Using strapply we match the regular expression to the input. The two parenthesized portions match the number

[R] Upgrading R using the global library folder strategy - what do you think about it?

Hello dear R-help mailing list, The other day I published a blog post (with some R code) to help R-users who want to implement a simpler upgrading strategy for R (under windows - but probably the same will be true of mac OS, I am not sure about Linux). This e-mail has 3 goals: (a) To share, (b)

[R] how to make read in a vector of 0s and 1s with no space between them

Hi all, Probably a rudimentary question. I have a flat file that looks like this (the real one has ~10e6 elements): 10110100101001011101011 and I want to pull that into R as a vector, but with each digit being it's own element. There are no separators between the digits. How can I accomplish

Re: [R] how to make read in a vector of 0s and 1s with no space between them

*Solution:* strsplit(c(10110100101001011101011), ) But make sure you change the output data type to the one you like (boolean, numeric and so on) Contact Details:--- Contact me: tal.gal...@gmail.com | 972-52-7275845 Read me:

Re: [R] how to make read in a vector of 0s and 1s with no space between them

Hi all, Quickly received an answer off the list. To do this is easy. Pull it in using e.g., scan(). Then use strsplit: z - '10001011010010' strsplit(z,'') On Sun, Apr 25, 2010 at 10:52 AM, Matthew Keller mckellerc...@gmail.com wrote: Hi all, Probably a rudimentary question. I have a flat

[R] Image into Excel file from R

Hi useRs, I would like to know what R users are employing to get their images/plots created in R, into Excel sheets. I am aware of the various packages (xlsReadWrite, RODBC) to get data frames into R, but I would like to copy images too. Thank you for any help in solving this problem. Regards,

Re: [R] categorical variable in scatterplot (car)

Hi John, The problem seems to be with the order in which the 'levels' of the conditioning variable appear. Here's a reproducible example: Prestige$tp- with(Prestige, ifelse(type == prof, 0, 1)) scatterplot(prestige ~ income | tp, data=Prestige) Note that I've just switched the 0/1 from your

Re: [R] categorical variable in scatterplot (car)

Thank you both for your helpful reply! And apologies for the lack of a reproducible example - I would/could send one now, but I believe Peter's example will suffice (and thank you for that). And making z a factor worked perfectly. Thank you! Anthony On Sun, Apr 25, 2010 at 10:20 AM, Peter

Re: [R] randomForest predictions with new data

On 25.04.2010 16:27, Rolf Edberg wrote: Hi I am new to R, randomForest and I have read about how to use it in your old mails. I have also run the predictions examples from CRAN. But I still don't understand how to use it right. The thing that I don't understand is how to run the result

Re: [R] Image into Excel file from R

Hi Harsh, I don't know the answer, But I would suggest you search and look at: rcom Contact Details:--- Contact me: tal.gal...@gmail.com | 972-52-7275845 Read me: www.talgalili.com (Hebrew) | www.biostatistics.co.il (Hebrew) |

Re: [R] Image into Excel file from R

On Apr 25, 2010, at 1:13 PM, Harsh wrote: Hi useRs, I would like to know what R users are employing to get their images/plots created in R, into Excel sheets. I am aware of the various packages (xlsReadWrite, RODBC) to get data frames into R, but I would like to copy images too. I guess

Re: [R] Image into Excel file from R

Thank you for the current set of replies. I am trying to send an image (png,jpeg) into an excel sheet after I have already sent a data table. To send a data table I am using (xlsReadWrite package and have also used the RODBC package). I wanted to create a plot in R and paste it into Excel from

Re: [R] Noobie question on aggregate tapply and by

Here's one way with aggregate() library(car) # You probably will need to install it. aggregate(DF[,3-4], by=list(years), mean,na.rm=TRUE) recode(x, c(1,2)='A'; else='B') DF$years - recode(DF$years, c(5,6,7)= '5-7') DF You may also want to have a look at the reshape and plyr packages. ---

Re: [R] Image into Excel file from R

Check this list for possibilities to try: http://rwiki.sciviews.org/doku.php?id=tips:data-io:ms_windowss=excel On Sun, Apr 25, 2010 at 1:42 PM, Harsh singhal...@gmail.com wrote: Thank you for the current set of replies. I am trying to send an image (png,jpeg) into an excel sheet after I have

Re: [R] Image into Excel file from R

See: https://stat.ethz.ch/pipermail/r-help/2010-January/225841.html -J __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide

[R] Determining Index of Last Element in Vector

Hi, Is there a way to specify the last element of a vector, similar to end in MATLAB? v[end] would be MATLAB for v(length(v)) in R. While `v(length(v))' does yield the last element, that approach fails in the following, rep(v, each=2)[-c(1,length(v))] which is meant to duplicate all

Re: [R] Image into Excel file from R

I am aware of the various packages (xlsReadWrite, RODBC) to get data frames into R, but I would like to copy images too. The xlsReadWritePro version could do it (see code below). It's a shareware package, but if people need/ask for a gratis license I send it (please download and check ?xls.lic

Re: [R] Determining Index of Last Element in Vector

Sorry -- I meant `v(end)' and `v[length(v)]' in the first examples of my message. Alan On Sun, Apr 25, 2010 at 11:10 AM, Alan Lue alan@gmail.com wrote: Hi, Is there a way to specify the last element of a vector, similar to end in MATLAB?   v[end] would be MATLAB for   v(length(v)) in

[R] replace question mark with a dash

Hi: I have the following dataset in R( thanks Gabor for your help) but now the problem is that all the dashes are converted to questions marks (?) I am trying to get the dashes back using: mydf - data.frame(lapply(mydf,function(x) replace(mydf,?(x),-))) but isn't working. I also tried: mydf -

Re: [R] Determining Index of Last Element in Vector

Hi Alan, Take a look at the following: x - 1:10 x[length(x)] [1] 10 tail(x) [1] 5 6 7 8 9 10 tail(x, 1) [1] 10 See ?tail for more information. HTH, Jorge On Sun, Apr 25, 2010 at 2:10 PM, Alan Lue wrote: Hi, Is there a way to specify the last element of a vector, similar to end

Re: [R] Determining Index of Last Element in Vector

On 4/25/2010 2:10 PM, Alan Lue wrote: Hi, Is there a way to specify the last element of a vector, similar to end in MATLAB? v[end] would be MATLAB for v(length(v)) in R. While `v(length(v))' does yield the last element, that approach fails in the following, rep(v,

Re: [R] how to make read in a vector of 0s and 1s with no space between them

See readBin(), e.g. r - readBin(pathname, what=raw, n=10e6); str(r); # raw [1:21] 30 31 30 31 ... c - rawToChar(x, multiple=TRUE); str(c); # chr [1:21] 0 1 0 1 0 0 1 0 1 0 ... i - as.integer(r); str(i); # int [1:21] 48 49 48 49 48 48 49 48 49 48 ... /Henrik On Sun, Apr 25, 2010 at 6:52 PM,

Re: [R] Determining Index of Last Element in Vector

On Apr 25, 2010, at 2:22 PM, Chuck Cleland wrote: On 4/25/2010 2:10 PM, Alan Lue wrote: Hi, Is there a way to specify the last element of a vector, similar to end in MATLAB? v[end] would be MATLAB for v(length(v)) in R. While `v(length(v))' does yield the last element, that

Re: [R] categorical variable in scatterplot (car)

Hi Peter, Thanks for the example. It was previously pointed out to me (in a private message) that the legend wasn't printed by scatterplot() when the groups variable isn't numeric. In fixing that, I also took care of the problem that you noticed. The fix is (or actually will be shortly) in the

Re: [R] Noobie question on aggregate tapply and by

thx I was struggling with the DF[,3:4] part of it On Sun, Apr 25, 2010 at 10:47 AM, John Kane jrkrid...@yahoo.ca wrote: Here's one way with aggregate() library(car) # You probably will need to install it. aggregate(DF[,3-4], by=list(years), mean,na.rm=TRUE) recode(x, c(1,2)='A';

Re: [R] replace question mark with a dash

Here you go :) require(stringr) t( apply(mydf, 1, function(x) {str_replace(x, \\?, -))}) ) Contact Details:--- Contact me: tal.gal...@gmail.com | 972-52-7275845 Read me: www.talgalili.com (Hebrew) | www.biostatistics.co.il

Re: [R] Determining Index of Last Element in Vector

Those are great solutions. Thanks so much for your help. Yours, Alan On Sun, Apr 25, 2010 at 11:43 AM, David Winsemius dwinsem...@comcast.net wrote: On Apr 25, 2010, at 2:22 PM, Chuck Cleland wrote: On 4/25/2010 2:10 PM, Alan Lue wrote: Hi, Is there a way to specify the last element of

Re: [R] 2 simple question

Yes, seems a wiser step really. Thank you! Tamas 2010/4/25 Jim Lemon j...@bitwrit.com.au On 04/25/2010 06:27 AM, tamas barjak wrote: Hi I do not speak in English very well, I'm sorry. I try good: layout(matrix(1:4,ncol=2, byrow=T)) = par(mfrow=c(2, 2)) plot(1,1)--- anddoes plot in

[R] substitution cipher

Hello. I am a student in social science at the University of Lausanne. I have a problem to solve with R. I'm desperately looking for someone who is able to solve it. The problem is the following: I need to decode a message using a substitution encryption. First, I must create the encryption in R

Re: [R] did you find a solution to this?

On 24.04.2010 20:48, st...@mindspring.com wrote: I wrote a followup to your old message which had no replies-- my situation is near identical, and, I wonder if you found a solution. (Running make check on R, failure of stats test.) Thanks, If these are the random tests, then there it

[R] Growth potential for open source math tools: 10 questions

Is there an need for more open source math tools in for-profit companies? If so, would targeted training and support help meet this need while benefiting the open source community? Please share your opinions and reasoning by answering the survey questions below. I've

Re: [R] 2 simple question

Hi On 25/04/2010 11:11 p.m., Jim Lemon wrote: On 04/25/2010 06:27 AM, tamas barjak wrote: Hi I do not speak in English very well, I'm sorry. I try good: layout(matrix(1:4,ncol=2, byrow=T)) = par(mfrow=c(2, 2)) plot(1,1)--- anddoes plot in the upper left corner plot(2, 2)--- upper right

[R] S4 generic and method arguments -- expanded signature

Hello R-List, ** This e-mail was initially bounced. Please forgive any duplicates.** I'm creating a new generic function and 3 associated methods, in which each of the methods only needs a subset of the arguments specified in the generic. So, I create the generic like so (with the signature

[R] numerical or not?

Hi, I've had a little problem for several weeks now. It is annoying and therefore I will ask for help now: When I write a script with several iterations, I make it write out a text file to save the data during the run. For example I write: if (i %% 25)

[R] Problem loading MLInterfaces

I have been using R 2.10.1. and Bioconductor but the package MLIntrefaces is not being loaded on my platform. the error message Error in loadNamespace(i[[1L]], c(lib.loc, .libPaths())) : there is no package called 'coin' Error in as.environment(pos) : no item called newtable on the search

[R] numerical or not?

Hi, I've had a little problem for several weeks now. It is annoying and therefore I will ask for help: When I write a script with several iterations, I make it write out a text file to save the data during the run. For example I write: if (i %% 25) write.table(output,temporary_output.txt)

Re: [R] Growth potential for open source math tools: 10 questions

Maybe I missed something - but *why* should we do it? Contact Details:--- Contact me: tal.gal...@gmail.com | 972-52-7275845 Read me: www.talgalili.com (Hebrew) | www.biostatistics.co.il (Hebrew) | www.r-statistics.com (English)

Re: [R] Image into Excel file from R

RExcel has a VBA command InsertCurrentRPlot which will put the current R plot into an Excel file. RExcel is an Excel addin and can be installed through the package RExcelInstaller available on CRAN. On 4/25/2010 8:11 PM, Hans-Peter Suter wrote: I am aware of the various packages (xlsReadWrite,

[R] R for Engineering (Mechanical, Industrial , Civil, etc.)

Hi useRs, In trying to take R to engineering undergraduate students, I have been looking for context that would make R more accessible to the said audience. Though R is primarily a statistical tool, I would want to demonstrate the use of R for certain engineering courses (Design of Machine

Re: [R] numerical or not?

On 25-Apr-10 21:20:44, Laetitia Schmid wrote: Hi, I've had a little problem for several weeks now. It is annoying and therefore I will ask for help: When I write a script with several iterations, I make it write out a text file to save the data during the run. For example I write: if (i

[R] Obvious reason for not looping twice?

Is there an obvious reason why this won't loop to i=2 and beyond? There are many combinations of *st* *vc* that don't exist in svc. For example, when s=1 there's only an entry at v=1. That's fine, the entry can stay 0. lookup.svc - array(0,dim=c(length(unique(svc$st)),length(unique(svc$vc))),

Re: [R] Problem loading MLInterfaces

I shall appreciate any words of directions . We'll see about that :-) Read the posting guide! 1. That is a Bioconductor package, so this is the wrong place to look for help. 2. Email the maintainer. We hate to hear about issues form the general list. See

Re: [R] how to make read in a vector of 0s and 1s with no space between them

On 25/04/2010 12:52 PM, Matthew Keller wrote: Hi all, Probably a rudimentary question. I have a flat file that looks like this (the real one has ~10e6 elements): 10110100101001011101011 and I want to pull that into R as a vector, but with each digit being it's own element. There are no

Re: [R] Tinn-R

Thanks Ben. Putting that code into my .Rprofile file helped; then it gets executed whenever R starts up. From: Ben Bolker bol...@ufl.edu To:r-h...@stat.math.ethz.ch Date: 20/Apr/2010 10:05a Subject: Re: [R] Tinn-R Robert Ruser robert.ruser at gmail.com writes: I want to use the free

Re: [R] Combinations with restrictions

Hi once again. just to let you know that i found the answer i need: http://www.mail-archive.com/r-help@r-project.org/msg65359.html Thank you once more. Cláudio 2010/4/24 Cláudio Sá c0870...@alunos.fc.up.pt Thank you for the quick answer, but i was asking if some method could do combinations

[R] function pointer question

Hello, I have the following function that receives a function pointer formal parameter name fnc: loocv - function(data, fnc) { n - length(data.x) score - 0 for (i in 1:n) { x_i - data.x[-i] y_i - data.y[-i] yhat - fnc(x=x_i,y=y_i) score - score + (y_i - yhat)^2

Re: [R] Obvious reason for not looping twice?

Tena koe Robin Do you get an error or warning? It may have something to do with how == treats NA: x - 1:4 x[x == 1] [1] 1 x - c(1:4, NA) x[x == 1] [1] 1 NA x[x %in% 1] [1] 1 If so, using %in% is one way to avoid the problem. However, I would have thought you'd get an error message if this

Re: [R] function pointer question

The beauty of trial and error ... if I leave the non x, y parameters i.e. h as global parameters rather than formal parameters for gaussiankernel it works fine basically I don't pass anymore h=0.5 to gaussiankernel but consume it from a global variable. Ugly but works ... Best regards,

[R] finite difference scheme for 2D differential equations

Hello everyone, I am trying to solve 2D differential equations using finite difference scheme in R. I have been able to work with the equations with only one spatial dimensions but I want to extend it to the two dimensional problem. For example i can simulate one dimensional diffusion using a

Re: [R] R-help Digest, Vol 86, Issue 26

Hi all folks, I would like to know if somebody has a PDF text with the first steps to use maps in R, like: insert maps, open maps, create adjacency matrix, make the moran index, etc. If somebody can send me a material of it I will be very glad and thankful Thanks a lot, Gildemir Silba

[R] PDF text to work with maps.

Hi all folks, I would like to know if somebody has a PDF text with the first steps to use maps in R, like: insert maps, open maps, create adjacency matrix, make the moran index, etc. If somebody can send me a material of it I will be very glad and thankful Thanks a lot, Gildemir Silba

[R] sum on column using apply

I have two data frames ( x and y -- sample values below). The rows have HH:MM:SS and columns have names of devices. I am trying to find a list of 5 least used devices during recorded time period. When apply function is used to sum on the column, I get the correct answer on data frame called

Re: [R] numerical or not?

If you are saving it to read back into R, then consider using 'save' and 'load'. It will avoid any problems that you might have when converting back and forth from the internal format to ascii data in a flat file. Also since you posted no data, there is no way we can help you solve the problem.

Re: [R] sum on column using apply

On Apr 25, 2010, at 10:15 PM, robert lee wrote: I have two data frames ( x and y -- sample values below). The rows have HH:MM:SS and columns have names of devices. I am trying to find a list of 5 least used devices during recorded time period. When apply function is used to sum on the

Re: [R] Growth potential for open source math tools: 10 questions

I went to this site --- half of the questions are about how much do you want to pay for training courses Kjetil On Sun, Apr 25, 2010 at 5:25 PM, Tal Galili tal.gal...@gmail.com wrote: Maybe I missed something - but *why* should we do it? Contact

Re: [R] sum on column using apply

Wanted to thank David and Jim for the str. The x and y were created using the function below. In one case, reshape1 returned list and other data frame. I put the fix by putting the as.data.frame below myPivot - function(y,x,z,m, ...){ m1 - m[c(x,y,z)] # select the the columns wanted

Re: [R] sum on column using apply

On Apr 25, 2010, at 11:30 PM, robert lee wrote: Wanted to thank David and Jim for the str. The x and y were created using the function below. In one case, reshape1 returned list and other data frame. I put the fix by putting the as.data.frame below I hope you are making progress on

Re: [R] did you find a solution to this?

(I thought I was posting in another thread that would have made it obvious what I was talking about. Thanks for replying!) I don't think this this is a random test, since the error is reproducible the same way every time. The attached archive has some relevent files, including config output

Re: [R] Upgrading R using the global library folder strategy - what do you think about it?

-Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Tal Galili Sent: Sunday, April 25, 2010 9:40 AM To: r-help@r-project.org Subject: [R] Upgrading R using the global library folder strategy - what do you think about it? Hello

[R] Unexpected warnings from summary() on mcmc.list objects

I am trying to get summary statistics from WinBUGS/JAGS output in the form of mcmc.list objects, using the summary() function. However, I get odd warning messages: Warning messages: 1: In glm.fit(x = X, y = Y, weights = weights, start = start, etastart = etastart, : algorithm did not converge

Re: [R] Table or file as STDIN to the R Script

Hi, I found my mistake after a week and yeah the above code by Mario works. I apologize for my previous post which says that it does not work. It was my fault as I made a blunder. Thanks a lot for the same. I am trying to redirect my output generated through my R script in the shell script by

[R] boosting with decision tree

Hi, Dear R community, Does anyone know how to constructdecision tree with boosting? Is any tutorial I can read? -- Sincerely, Changbin -- [[alternative HTML version deleted]] __ R-help@r-project.org mailing list

[R] Tapply.

Having some difficulties with understanding how tapply works and getting return values I expect Data: dataframe. DF DF$Id $D $Year... Id D Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 11264402000 1 1980 NA NA NA NA NA 212 203 209 228 237 NA

[R] logical(0) response from lrm

What causes the error report: logical(0) to arise in the rms function lrm? Here's my data: But both the dependent and the independent variable seem fine... str(AABB) 'data.frame':1176425 obs. of 9 variables: $ sex : int 1 1 0 1 1 0 0 0 0 0 ... $ faint : int 0 0 0 0 0 0 0 0 0 0