Displaying 20 results from an estimated 2000 matches similar to: "rpart help"
2011 Oct 17
1
Build 64-bit R Solaris 10 Sparc
Hello All,
Has anyone had success building 64-bit R on Solaris 10 Sparc with the Oracle Studio Compiler suite? Could anyone start give me a clue. I have tried to no avail.
Thanks,
Nynese
Nynese Tinsley, BSEE, MSCIS
UNIX Systems Analyst
Harvard School of Public Health
Center for Biostatistics in AIDS Research
651 Huntington Ave, FXB 614
Boston, MA 02115
617-432-3244 office#
2011 Aug 03
0
Help Needed in attempting to install 64-bit R!
Hello R Help,
I am attempting to install/build a 64-bit version of R to hopefully resolve some memory.limit problems for a user who is running a simulation. The 'configure' runs fine and the compilation (make) runs fine until the very last part (see below). I have libiconv in /usr/local/lib (no sure why I am getting the referencing error). The config.site file is attached. ANY HELP YOU
2003 Feb 15
2
(no subject)
Hi,
Are there some packages which can generate multi-normal, multi-t, etc
multivariate sampling? thanks!
Best wishes,
Peng
*******************************
Peng Zhang
Department of Biostatistics
Harvard School of Public Health
655 Huntington Avenue
Boston, Massachusetts 02115
*******************************
I believe I can fly
I believe I can touch the sky
2003 Feb 16
1
multivariate sampling question again
Hi
Thanks for replying my question! What really interested me is that the
package providing some complex form sampling, such as wishart,
multinomial, dirichlet. And others for example conditional beta
distribution confining the random variable in the interval (a, b). Since
these concept are widely used in the baysian, I wonder whether somebody
has already written this package. Thanks!
Best
2009 May 21
1
Rpart - best split selection for class method and Gini splitting index
Dear R-users,
I'm working with the Rpart package and trying to understand how the
procedure select the best split in the case the method "class" and the
splitting index "Gini" are used. In particular I'd like to have look to the
source code that works out the best split for un unordered predictor.
Does anyone can suggest me which functions in the sources I should
2008 Feb 10
1
Using 'sapply' and 'by' in one function
Greetings,
I'm having a problem with something that I think is very simple - I'd
like to be able to use the 'sapply' and 'by' functions in 1 function
to be able (for example) to get regression coefficients from multiple
models by a grouping variable. I think that I'm missing something
that is probably obvious to experienced users.
Here's a simple (trivial)
2003 Feb 09
2
installation on FreeBSD
Hello there,
I just changed to FreeBSD platform, and want to install R on it. I use
FreeBSD 5.0 and install nearly all packages on the machine. When I use
ports to install R, (cd /usr/ports/math/R-letter, and then type make) I
got the following error information.
../../../../library/methods/libs/methods.so is unchanged
dumping R code in package 'methods'
Fatal error: The X11 shared
2009 Jun 09
3
rpart - the xval argument in rpart.control and in xpred.rpart
Dear R users,
I'm working with the rpart package and want to evaluate the performance of
user defined split functions.
I have some problems in understanding the meaning of the xval argument in
the two functions rpart.control and xpred.rpart. In the former it is defined
as the number of cross-validations while in the latter it is defined as the
number of cross-validation groups. If I am
2009 May 14
0
Rpart - user defined split functions
Dear all,
I'm writing my own method to be used in Rpart by defining the list of
functions named init, split and eval. I'm following the example given in the
file 'tests/usersplits.R' in the sources.
By now I'm able to define the split function (and it works correctly in the
tree construction) while I have some problems with the init and the eval
function.
The task I'm
2009 May 26
0
cross-validation in rpart
Dear R users,
I know cross-validation does not work in rpart with user defined split
functions. As Terry Therneau suggested, one can use the xpred.rpart function
and then summarize the matrix of the predicted values into a single
"goodness" value.
I need only a confirmation: set for example xval=10, if I correctly
understood a single column of the matrix obatined by xpred.rpart gives
2009 Feb 01
0
possible memory leak involving looping, optimization, and gam
When I run the gam function as part of an optimization and do the optimization many times using a loop, I'm finding that memory use increases over time (based on simply monitoring top). Below is some example code that involves varying the penalty parameter in gam, trying to find the value that gives exactly 50 edf for a simple smoothing problem. I thought I would post to the list to see if
2010 Feb 12
1
R - Compiling and calling Fortran code that uses IMSL libraries - Help!
Good Afternoon R Help!
On of my users is seriously thinking about moving to R from Splus. In his
testing, he has already found some benefits to it. He has, however run
into one issue, calling his Fortran functions in R. Previously, in Splus,
he would do the following:
1. Compile via f90 the *.f program
2. link the object file to the Fortran IMSL libraries via the 'ld' command
3.
2008 Apr 18
1
configure can't find dgemm in MKL10
Hi,
I'm trying to follow the R-admin instructions for using MKL10 as the external BLAS compiling R-2.6.2 under Linux on a RH EL head node of a cluster. The configure process seems to have problems when it checks for dgemm in the BLAS. I'm using configure as:
./configure CC=icc F77=ifort --with-lapack="$MKL" --with-blas="$MKL" where $MKL is defined as in R-admin
2003 Jul 24
3
trellis plot question
Greetings,
Does anyone know how to get an id number in the little header
above each individual plot within a trellis plot? The default
seems to be to print the word id and add a line indicating on
a linear scale where the current id sits.
Thanks in advance for any help you can send,
Suzette
=================================
Suzette Blanchard, Ph.D.
Research Scientist
Frontier Science
2008 Jul 22
2
rpart$where and predict.rpart
Hello there. I have fitted a rpart model.
> rpartModel <- rpart(y~., data=data.frame(y=y,x=x),method="class", ....)
and can use rpart$where to find out the terminal nodes that each
observations belongs.
Now, I have a set of new data and used predict.rpart which seems to give
only the predicted value with no information similar to rpart$where.
May I know how
2005 Mar 15
0
need help with plot.rpart and text.rpart
Hi,
I am new to R and need help with rpart. I am trying to create a
classification tree using rpart. In order to plot the reults I use the
plot function and the text function to label the plot of the tree
dendrogram with text. The documentation of text.rpart says : "For the
"class" method, label="yval" results in the factor levels being used,
"yprob" results
2011 Dec 20
0
rpart weight parameter and random forest based on rpart
Hi all,
I am very new to R (only two days of studies). I know a little bit of
statistical learning and looking for an implementation of CART and random
forest and therefore I am now studying R.
I tested with rpart and randomForest package, they are quite good.
However, I need a classification tree and for each training data, there is
different loss. (i.e. the loss function is not purely 0-1,
2006 Aug 22
0
rpart output: rule extraction beyond path.rpart()
Greetings -
Is there a way to automatically perform what I believe is called "rule
extraction" (by Quinlan and the machine learning community at least) for
the leaves of trees generated by rpart? I can use path.rpart() to
automatically extract the paths to the leaves, but these can be
needlessly cumbersome. For example, one path returned by path.rpart()
might be:
[1]
2012 Aug 01
1
rpart package: why does predict.rpart require values for "unused" predictors?
After fitting and pruning an rpart model, it is often the case that one or
more of the original predictors is not used by any of the splits of the
final tree. It seems logical, therefore, that values for these "unused"
predictors would not be needed for prediction. But when predict() is called
on such models, all predictors seem to be required. Why is that, and can it
be easily
2010 Apr 11
0
plotting rpart objects, text.rpart, fancy option
I have created plots of rpart objects with the fancy option for text.rpart
("fancy" creates ellipses and rectangles and labels branches with splitting
criteria). The ellipses and rectangles are supposed to "interrupt" the tree
lines (as seen in Therneau and Atkinson 1997, page 48, Fig. 18,
http://www.mayo.edu/hsr/techrpt/61.pdf), but they do not, even when I use
Therneau and