Displaying 20 results from an estimated 10000 matches similar to: "Where to find the source codes for the internal function in stats package"
2003 Apr 13
2
Peculiarity in non-central qchisq for ncp > 294.92 ...
Hello all,
Here's my query:
Running R 1.6.2 on FreeBSD 5.0, and on WinXP, and I find that the
following hangs the process:
dchisq(alpha=0.01, df=1, ncp=295)
but it does work for ncp < 294.92.
Is this general?
Best wishes to all,
Andrew
Andrew Robinson Ph: 208 885 7115
Department of Forest Resources Fa: 208 885 6226
University of Idaho E : andrewr at uidaho.edu
PO
2000 Dec 14
2
Accuracy problem in dchisq for non-central chi-squared
Hi,
I think I have identified a inaccuracy in dchisq when the non-centrality
parameter is non-zero and large. Here's a little test:
sys.dchisq.test <- function(N = 100000,mean = 0)
{
z <- rnorm(N,mean = mean, sd = 1)
x <- z^2
xmin <- min(x)
xmax <- max(x)
br <- seq(xmin,xmax,length = 101)
dbr <- br[2]-br[1]
hist(x,br)
p <- dchisq(br,df = 1,ncp =
2009 Oct 09
2
Creating a Clustered-Stacked Column Chart
Hi all,
In R, is there some functions or ways to create a Clustered-Stacked
Column Chart as the example in the following page
http://peltiertech.com/Excel/ChartsHowTo/ClusterStack.html?
I have browsed the R Graph Gallery (http://addictedtor.free.fr/graphiques/)
and searched the R site, and didnot find an appropriate method to do it.
Anybody has met this problem before?
Thanks a lot.
2008 Aug 21
1
pnmath compilation failure; dylib issue?
(1) ...need to speed up a monte-carlo sampling...any suggestions about
how I can get R to use all 8 cores of a mac pro would be most useful
and very appreciated...
(2) spent the last few hours trying to get pnmath to compile under os-
x 10.5.4...
using gcc version 4.2.1 (Apple Inc. build 5553) as downloaded from
CRAN, xcode 3.0...
...xcode 3.1 installed over top of above after
2001 May 18
1
Non-Central t
In the help file for the non-central t, the following appears:
ncp: non-centrality parameter delta; currently `ncp <= 37.62'.
I assume that this means the ncp cannot exceed 37.62. Is this
still the case and is there any plans to increase this restriction?
Thanks!
Jeff
Jeff Morris
Design Support
Clinical Chemistry R&D
Ortho-Clinical Diagnostics
email: jmorris6 at ocdus.jnj.com
2003 Feb 14
1
FW: [Fwd: Re: [S] Exact p-values]
Dear all
Just for fun, I have just downloaded the paper mentioned below and checked
it with R-1.6.1.
Everything is ok with exception of Table 2b, where I get always 1 instead of
0.5:
> pbinom(1e15,2e15,0.5)
[1] 1
Which value should be correct?
Best regards
Christian Stratowa
==============================================
Christian Stratowa, PhD
Boehringer Ingelheim Austria
Dept NCE Lead
2002 Oct 17
3
Non-central distributions
Hi Folks,
I note that, while the "chisq" functions
dchisq(x, df, ncp=0, log = FALSE)
pchisq(q, df, ncp=0, lower.tail = TRUE, log.p = FALSE)
qchisq(p, df, ncp=0, lower.tail = TRUE, log.p = FALSE)
rchisq(n, df, ncp=0)
all have a slot for the non-centrality parameter "ncp", of
the functions for the t and F distributions:
dt(x, df, log = FALSE)
2009 Jul 29
2
cannot allocate a vector with 1920165909 length
Dear Rusers,
The error for the following was that it cannot allocate the vector of
length 1920165909.
a <- expand.grid(se1=0:100/100, sp1=0:100/100, se2=0:100/100, sp2=0:100/100,
DR=0:100/100)
How to solve it? Maybe setwd(dir) can, i am not very sure about it.
Any ideas about it?
[[alternative HTML version deleted]]
2012 Feb 11
2
How to see a R function's code
I was wondering how do I actually see what's inside a function, say,
density of t distribution, dt()?
I know for some, I can type the function name inside R and the code will be
displayed. But for dt(), I get
> dt
function (x, df, ncp, log = FALSE)
{
if (missing(ncp))
.Internal(dt(x, df, log))
else .Internal(dnt(x, df, ncp, log))
}
<environment: namespace:stats>
I
2009 Jul 27
2
How should i change the SAS Codes into R Codes?
Dear R users,
I have a SAS codes with several loops in it, and i hope to use R to do the
same task. The SAS codes are as follows,
/*to generate the dataset*/
DATA Single_Simulation;
DO se=0 to 1 by 0.01;
DO sp=0 to 1 by 0.01;
DO DR=0 to 1 by 0.01;
TR=(DR+sp-1)/(se+sp-1+1.0e-12);
Adjust_Factor=TR/(DR+1.0e-12);
OUTPUT;
END;
END;
END;
RUN;
/*to select some data*/
DATA
2006 Jul 13
3
set the bahavior that R deal with missing values?
Dear Rusers,
The default behavior in R when performing a regression model with missing
values is to exclude any case that contains a
missing value? How could i set the bahavior that R deal with missing values?
e.g.:
exclude cases listwise
exclude cases pairwise
replace with mean
Thanks very much!
--
Kind Regards,
Zhi Jie,Zhang ,PHD
Department of Epidemiology
School of Public Health
Fudan
2008 Dec 06
1
Questions on the results from glmmPQL(MASS)
Dear Rusers,
I have used R,S-PLUS and SAS to analyze the sample data "bacteria" in
MASS package. Their results are listed below.
I have three questions, anybody can give me possible answers?
Q1:From the results, we see that R get 'NAs'for AIC,BIC and logLik, while
S-PLUS8.0 gave the exact values for them. Why? I had thought that R should
give the same results as SPLUS here.
2007 Sep 13
2
handle dates in R?
Dear Rusers,
I have some data in .csv file like "2004-8-1" and "2004-10-1", and i need
to convert them into days from the origin (January 1, 1960).
I have tried the function date.mmddyyyy(), but cannot get it. Anybody can
show me how to handle the date data?
Thanks very much!
My dataset like:
time
2004-8-1
2004-10-1
2001-9-1
2002-9-1
--
With Kind Regards,
2006 Jul 02
2
how to recode in my dataset?
Dear Rusers,
My question is about "recode variables". First, i'd like to say
something about the idea of recoding:
My dataset have three variables:type,soiltem and airtem,which means
grass type, soil temperature and air temperature. As we all known, the
change of air temperature is greater than soil temperature,so the
values in those two different temperaturemay represent different
1997 Jul 09
1
R-beta: Problem with `rpois'
There is a problem with `rpois'. It does seem to take care about the
order of the arguments. This is an example:
> rpois(n=1,lambda=2)
[1] 3
> rpois(lambda=2,n=1)
[1] 2 0
It obviously uses the first argument as the number of samples to be
drawn, which is wrong.
I used Version 0.49 Beta (April 23, 1997).
Fredrik
1997 Jul 09
1
R-beta: Problem with `rpois'
There is a problem with `rpois'. It does seem to take care about the
order of the arguments. This is an example:
> rpois(n=1,lambda=2)
[1] 3
> rpois(lambda=2,n=1)
[1] 2 0
It obviously uses the first argument as the number of samples to be
drawn, which is wrong.
I used Version 0.49 Beta (April 23, 1997).
Fredrik
2008 Jun 02
2
High resolution figures for a paper?
Dear Rusers,
My manuscript has been conditionally accepted recently. The problem to
generate the high resolution figures in R for the manuscript cannot be
solved by me.
The journal editor ask me to generate the figures with a minimum resolution
of 500 dpi. I have tried the *menu-driven method* to save the figures as
JPEG (100% printed quality), but the results seem not to be very good. I
have
2006 Nov 07
1
plot questions?-errors in persp(x1, x2, y) and contour(x1, x2, y)
Dear Uwe Ligges ,
I still can't finish it.
*> aa* #my data
x1 x2 y
5 0.05 6 4.4180
1 0.50 3 2.6979
4 0.50 9 2.9000
7 0.95 6 2.6230
8 0.95 6 2.9078
9 0.95 6 2.6727
3 1.40 3 2.4203
2 1.40 9 2.5329
6 1.85 6 2.4867
*> attach(aa)*
*> persp(x1,x2,y*
error in persp.default(x1, x2, y) : increasing 'x' and 'y' values expected
2009 Mar 17
3
R does not compile any more on FreeBSD 8.0-CURRENT
On a recent FreeBSD 8.0-CURRENT (i386) building R (any version) breaks
with the following messages:
----------------------------------------------------------------------
[...snip...]
gcc -std=gnu99 -I. -I../../src/include -I../../src/include
-I/usr/local/include -DHAVE_CONFIG_H -g -O2 -c wilcox.c -o wilcox.o
gcc -std=gnu99 -I. -I../../src/include -I../../src/include
-I/usr/local/include
2004 Aug 10
0
Check failed after compilation (PR#7159)
Full_Name: Madeleine Yeh
Version: 1.9.1
OS: AIX 5.2
Submission from: (NULL) (151.121.225.1)
After compiling R-1.9.1 on AIX 5.2 using the IBM cc compiler, I ran the
checks. One of them failed. Here is the output from running the check solo.
root@svweb:/fsapps/test/build/R/1.9.1/R-1.9.1/tests/Examples:
># ../../bin/R --vanilla < stats-Ex.R
R : Copyright 2004, The R