Displaying 20 results from an estimated 4000 matches similar to: "regular expression question"
2011 Jan 10
4
Meaning of pterms in survreg object?
I am trying to model survival data with a Weibull distribution
using survreg. Units are clustered two apiece, sometimes receiving
the same treatment and sometimes opposing treatment.
2008 Jul 13
3
initialize a factor vector
What is the least surprising way of initializing a factor with
predefined levels and with length 0?
as.factor(c("eins", "zwei", "drei"))[FALSE]
does the job but looks a bit weird.
--
Johannes H?sing There is something fascinating about science.
One gets such wholesale returns of conjecture
mailto:johannes at
2010 Sep 30
2
Sweave and LaTeX beamer class
I am failing to uncover Sweave chunks step by step using the LaTeX beamer
class.
The following minimal example:
\documentclass{beamer}
\usepackage{Sweave}
\begin{document}
\begin{frame}[fragile]
In the year \uncover<2->{25}\uncover<3->{\Sexpr{5*5}}
\uncover<4->{
<<echo=TRUE, print=TRUE>>=
5*5*101
@
}
\end{frame}
\end{document}
leads to an error message when
2008 Nov 04
2
strange list structure question
my problem is more complex than below but I think below can suffice. i
have a list and the name of it at the top level is GGG. so, if i do an
lapply and operate on lower components in the sublist, then I can do as
shown in EXAMPLE 1 and what will come back will be named GGG at the top
level.
but, suppose that , the function inside the lapply function was more
complex and i wanted to
2008 Jul 27
4
Object-oriented programming in R for Java programmers?
Hi,
I was wondering if anybody might have a reference for
me: My R code is growing and getting more and more
confusing. Thus, I figure it's time to switch to
object-oriented again. I have done oo programming in
C++ and Java before but the first few tutorial on R oo
were a bit confusing for me.
Is there any brief tutorial on oo programming in R
especially for people who have done oo in Java
2010 Oct 25
2
Text wrapping in R
I am about to give an introduction to R to some clinical data managers
used to SAS. There is already a lot of material in printed form and
on the web that paves the way. What I haven't found so far are text
wrapping capabilities in setting tables in raw text as in SAS PROC
REPORT.
At the moment i would direct them at producing HTML output from R
and pipe the result through lynx. Coming from
2009 Mar 21
1
libRlapack.so not found
Whenever I try to load the Matrix package, I get the following error
message:
libRlapack.so: cannot open shared object file: No such file or directory
A file with that name is indeed not on the hard disk.
I am using the R version which comes with Ubuntu Hardy Heron LTS. Here
is the output of R.Version():
R.Version()
$platform
[1] "i486-pc-linux-gnu"
$arch
[1] "i486"
$os
[1]
2010 Jun 28
6
Basic question - more efficient method than loop?
I'm guessing there's a more efficient way to do the following using the index
features of R. Appreciate any thoughts....
for (i in 1:nrow(dbs1)){
if(dbs1$Payor[i] %in% Payor.Group.Medicaid) dbs1$Payor.Group[i] =
"Medicaid"
if(dbs1$Payor[i] %in% Payor.Group.Medicare) dbs1$Payor.Group[i] =
"Medicare"
if(dbs1$Payor[i] %in% Payor.Group.Commercial)
2008 Jan 11
3
Randomization tests, grouped data
The other day I was looking into one of the classics in resampling,
Eugene Edgington's "Randomization Tests". This type of test is simple
to do in R with things like a simple correlation, the sample ()
function is perfect for the purpose.
However, things are more complex if you have grouped data, like a
one-way ANOVA. The reason is that you have to avoid the consideration
of
2008 Dec 04
1
Formula parsing and updating
Hi all,
I can't come over a problem with formula. Suppose I have a coxmod model
with the following formula:
> somemod$formula
Surv(lebzeit, tot == 1) ~ sex + (alter >= 65) + diff3k + zelltyp_k_c +
q_nuc_3k + kar_k80_g80 + stadium
and I want to drop the stadium explanatory variable from the model with
> update(somemod, ". ~ . - stadium")
I get the following messages:
2010 Feb 10
3
Novel (Maybe?) Visualizations
I'm interested in using R's plotting capabilities to try to generate a graph showing the relationship/pairing frequency of words appearing in a block of unstructured text. I don't have a specific algorithm or approach in mind, just looking to portray text in an interesting fashion. The output I'm hoping for is something like the following called a "Phrase Network":
2008 Feb 03
1
How to create following chart for visualizing multivariate time series
Hi all,
Can anyone here please tell me whether is it possible to produce a chart displayed in http://www.datawolf.blogspot.com/ in R for visualizing multivariate time series? If possible how?
Regards,
---------------------------------
[[alternative HTML version deleted]]
2009 May 16
1
Gamma
Hey,
I am having trouble graphing the following function
√2Γ(n/2)/[√n − 1Γ((n − 1)/2 for the values of n between 2 and 50.
i know that Γ(n) = (n-1)!, which in R is factorial(n-1)
When i type that into R, using y <- function(n).....
and
then plot(y,2,50), it doesnt give me anything meaningful, in fact, it
comes up with a message saying something like "in gamma(n+1) ploted" or
2010 Jul 29
3
Statistical mailing list
I am looking for a mailing list for general statistical questions that
are not R related. Do you have any suggestions for lists that are busy
and helpful and/or lists that you use and recommend?
Thanks in advance,
Ralf
2010 Nov 01
1
combining plots (curve + Plot functions)
Hello,
?
What I really want to do is to add a rejection region in the
form of a long rectangle to a density plot I have drawn.?
I am getting? 2 plots.?
How can I add rectangle to first plot?? see code below.
First section works fine.? It just is not quite what I want.
# NORMAL DISTRIBUTION PLOT OF RAW DATA WITH UPPER CRITICAL LEVEL - ok
xcrit=144.1
# *** single-sample Upper one-tailed
2010 Nov 13
1
Sweave question
It seems that Sweave is supposed to be used from Latex and R is called
during the LaTeX compilation process whenever R chunks appear. What
about the other way round? I would like to run it triggered by R. Is
this possible? I understand that this does not correspond to the idea
of literate programming since it means that there is R code running
outside the document, but for my practical approach, I
2010 Nov 24
1
diverting output from nested loops
Dear List,
I have a series of nested loops with the structure shown below, and I am
struggling to figure out how to divert output to folders created with
dir.create() within the loops.
What I need is for the output to end up as topNameK/subNameL/objNameM.pdf;
what I get instead is a series of directories topNameK/, directories
subNameL/, and files objNameM.pdf, all in the working directory. Any
2011 Jun 02
1
(no subject)
Error in lda.default(x, grouping, ...) :
variables 1 3 5 8 10 15 17 20 27 29 34 appear to be constant within groups
what this sentence means??
[[alternative HTML version deleted]]
2014 Oct 19
2
Checking if a matrix exists/is defined
Hello
Can someone help me with the following, specifically in judging
whether a matrix exists. I have trouble with the first line below. In
this case, matrix obj$hessian exists and is 74 x 74. I receive the
error message:
Warning message:
In all(w$hessian) : coercing argument of type 'double' to logical
Thank you all.
---
if (!all(obj$hessian)|OPG){
vb<-obj$gradientObs;
2009 Mar 24
3
generalized Poisson regression
Dear sir,
I want to know about R command for parameter estimation for generalized
Poisson regression.
yours faithfully
Arafat Ud Zaman
4th year(Hons)
Applied statistics
University of Dhaka
Mob- +8801715173176
E-mail: arafat.zaman@yahoo.com
azaman1@isrt.ac.bd
azaman1@quantummethod.org.bd
[[alternative HTML version deleted]]