Displaying 20 results from an estimated 1000 matches similar to: "Greater than 1 or less than 1?"
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
1999 Apr 09
7
Error in ppois function (PR#161)
Full_Name: Murray H Smith
Version: 0.63.3
OS: Windows NT
Submission from: (NULL) (130.216.5.57)
The ppois function is displaced by -0.5.
Try:
> ppois(-0.5,1)
[1] 0.3678794
> ppois(-0.51,1)
[1] 0
> ppois(0,1)
[1] 0.3678794
and
> par(mfrow=c(2,1))
> x<-seq(-1,5,0.01)
> plot(x,ppois(x,1),type="s",ylab="F(x)",main="Poisson CDF?")
>
2018 Dec 04
3
Bug report: Function ppois(0:20, lambda=0.9) does not generate a non-decreasing result.
Le 04/12/2018 ? 11:27, I?aki Ucar a ?crit?:
> On Tue, 4 Dec 2018 at 11:12, <qweytr1 at mail.ustc.edu.cn> wrote:
>> function ppois is a function calculate the CDF of Poisson distribution, it should generate a non-decreasing result, but what I got is:
>>
>>> any(diff(ppois(0:19,lambda=0.9))<0)
>> [1] TRUE
>>
>> Actually,
>>
>>>
2018 Dec 03
2
Bug report: Function ppois(0:20, lambda=0.9) does not generate a non-decreasing result.
function ppois is a function calculate the CDF of Poisson distribution, it should generate a non-decreasing result, but what I got is:
> any(diff(ppois(0:19,lambda=0.9))<0)
[1] TRUE
Actually,
> ppois(19,lambda=0.9)<ppois(18,lambda=0.9)
[1] TRUE
Which could not be TRUE.
Code is tested in both R 3.5.1 and Microsoft R Open 3.5.1.
_
2004 Jan 09
4
Poisson distribution help requested
Could somebody help me to understand the syntax of R's ppois function? I'm looking to calculate the cumulative probability density of an observed value (y) given the expected mean (mu) and the level of significance (alpha). I'm coming from using SAS to do this and don't recognize the descriptions of the arguments for ppois. The definitions of lambda and p as stated in the R manuals
2002 Feb 28
4
pexp.c (PR#1335)
Full_Name: M Welinder
Version: 1.4
OS: (src)
Submission from: (NULL) (192.5.35.38)
It seems to me that pexp can be improved in the lower_tail=TRUE and log_p=FALSE
case by using expm1. Something like
-expm1 (-x / scale);
I think.
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Send
2004 Jun 27
1
cross-compiling + expm1
Hello all,
Just joined this mailing list -- not sure if this is the right list to
send this question, but I have a question about cross-compiling R. I am
working with R-1.9.1.tgz.
It may just be with my version of mingw32, but it seems that expm1 is
not defined, so I tried to ensure that HAVE_EXPM1 was #undef'ed before
cross-compiling. The problem is that, in <include/Rmath.h> if
2010 Oct 25
2
Ayuda con una función
Reciban un cordial saludo.
De manera muy comedida les pido ayuda con la función indicada abajo. La usan
en un artículo de inventarios. No veo dónde estoy errado.
Gracias de antemano.
César Escalante C.
> lamb<-50
> L<-1
> h.<-10
> p<-25
> K<-5
> integ<-function(y){integrate(function(x)ppois(x,lamb*L),0,y)$value}
> G<-function(y){(h.+p)*integ(y) +
2004 Oct 16
7
sapply and loop
Dear all,
I am doing 200 times simulation. For each time, I generate a matrix and
define some function on this matrix to get a 6 dimension vector as my
results.
As the loop should be slow, I generate 200 matrice first, and save them into
a list named ma,
then I define zz<-sapply(ma, myfunction)
To my surprise, It almost costs me the same time to get my results if I
directly use a loop
2004 Oct 16
7
sapply and loop
Dear all,
I am doing 200 times simulation. For each time, I generate a matrix and
define some function on this matrix to get a 6 dimension vector as my
results.
As the loop should be slow, I generate 200 matrice first, and save them into
a list named ma,
then I define zz<-sapply(ma, myfunction)
To my surprise, It almost costs me the same time to get my results if I
directly use a loop
2006 Sep 20
2
Poission distribution
The expected number of bladder cancer over next 20 years a tire
industry is 1.8. Poission distribution is assumed to hold and 6
reported deaths are caused by bladder cancer among the employees.
Trying to find how unusual this event is.
> ppois(q=6, lambda=1.8, lower.tail = TRUE, log.p = FALSE)
[1] 0.9974306
not sure if ppois is the right one to use and the parameters...
thx much
2004 Sep 30
1
Vectorising and loop (was Re: optim "a log-likelihood function")
>From: Sundar Dorai-Raj <sundar.dorai-raj at PDF.COM>
>Reply-To: sundar.dorai-raj at PDF.COM
>To: Zhen Pang <nusbj at hotmail.com>
>CC: r-help at stat.math.ethz.ch
>Subject: Vectorising and loop (was Re: [R] optim "a log-likelihood
>function")
>Date: Wed, 29 Sep 2004 18:21:17 -0700
>
>
>
>Zhen Pang wrote:
>
>>
>>I also use
2007 May 23
2
Possible ld.exe problem when building
Dear R People:
I am trying to build R-2.5.0 from source on a Windows machinee.
I downloaded the tools and such, and started things off.
I received some odd errors messages, looked on the R Search
and found a similar problem. The suggestion was to re-load
"ld.exe".
I downloaded and installed everything again. Same problem.
I am including my output.
2004 Jun 21
2
Cross build Makefile
Hello,
I am trying to use Yan and Rossini's Makefile for cross building Windows
versions of R packages in Linux with R 1.9.0. When compiling R with the
mingw tools I get an error about expm1 being undeclared when first found
at src/main/arithmetic.c:1019
If I fiddle a bit with it later on I also get errors about log1p bein
undeclared.
Any idea what should I look for?
I am using R 1.9.0 in
2004 Jun 21
2
Cross build Makefile
Hello,
I am trying to use Yan and Rossini's Makefile for cross building Windows
versions of R packages in Linux with R 1.9.0. When compiling R with the
mingw tools I get an error about expm1 being undeclared when first found
at src/main/arithmetic.c:1019
If I fiddle a bit with it later on I also get errors about log1p bein
undeclared.
Any idea what should I look for?
I am using R 1.9.0 in
2009 Oct 16
2
what's the R code for wavelet decomposition (Haar transformation)?
Dear all,
Using R function "dwt", it seems that I cannot specify the wavelet
transformation like Haar. What's the R code for wavelet decomposition
which allows me to specify Haar wavelet transformation? Of course, if it
can include "db2", that is even better. In general, I want an R function
like matlab code "dwt". Thanks in advance!
Zhen Li
2006 Sep 20
1
ppois
A quick question!
The number of episodes per year of otitis media follows a Possion
distribution with lambda = 1.6 episodes per year. Wouldn't the
probability of getting 3 or more episodes of otitis media in the first
2 years of life be:
> ppois(q=3, lambda=1.6*2, lower.tail = TRUE, log.p = FALSE)
[1] 0.6025197
I am confused with the lambda and 3 or more..
thx much
2002 Feb 28
1
pweibull.c (PR#1334)
Full_Name: M Welinder
Version: 1.4
OS: (src)
Submission from: (NULL) (192.5.35.38)
It seems to me that pweibull can be improved in the lower_tail=TRUE and
log_p=FALSE
case by using expm1. Something like
-expm1(-pow(x / scale, shape)),
I think.
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-devel mailing list -- Read
2004 Jan 15
1
Exactness of ppois
Hello,
by checking the precision of a convolution algorithm, we found the
following "inexactness":
We work with R Version 1.8.1 (2003-11-21) on Windows systems (NT, 2000,
XP).
Try the code:
## Kolmogorov distance between two methods to
## determine P(Poisson(lambda)<=x)
Kolm.dist <- function(lam, eps){
x <- seq(0,qpois(1-eps, lambda=lam), by=1)
max(abs(ppois(x,
2003 Oct 10
3
command line limit under unix?
Dear all,
I have made my testing program to run successfully under unix in the
background. However, my simulation work does not work. I read the
foo.results file, I found it only have part of my code and not any output I
want. Is there any line limit? My code is nearly 400 line. I can cut some of
them, but I want to know whether there is any limit or exactly the number of
limit is. Thanks.