p@r-project.org"
Sent: Tuesday, December 27, 2011 9:15 AM
Subject: Re: [R] rbinom
On Dec 27, 2011, at 15:47 , Scott Raynaud wrote:
> I have the following code (which I did not write) that generates
> data based on a logistic model. I'm only getting a single record
> with y=1.
On Dec 27, 2011, at 15:47 , Scott Raynaud wrote:
> I have the following code (which I did not write) that generates
> data based on a logistic model. I'm only getting a single record
> with y=1. It seems implausible that in 50k cases that have a
> single y=1. Does that ring alarm bells for
On Feb 4, 2011, at 4:24 PM, Mcmahon, Kwyatt wrote:
Hello compadRes,
I'm developing a script that selects "cells" over a certain
metabolic rate to kill them. A rate between 9 and 12 means that the
cells are candidates for death.
I'll show you what I mean:
# a would be a vector of cell m
ACroske yahoo.com> writes:
>
>
> Ben:
> Thanks for the reply. One further question, and this is where my novice
> status at R shows through. The code makes sense, but what would I put it for
> "m"? Is it the same number for all three (that was my first thought since it
> was the same placeholde
Yes I do want a random assignment, instead of rounding. (From what I
understand of the rbinom command, it will randomly assign 1 or 0, and the
higher the given probability, the higher the likelihood of a 1... Feel free
to correct me if I'm wrong!)
Ben Bolker wrote:
>
> -BEGIN PGP SIGNED ME
Ben:
Thanks for the reply. One further question, and this is where my novice
status at R shows through. The code makes sense, but what would I put it for
"m"? Is it the same number for all three (that was my first thought since it
was the same placeholder for all three). Number of rows in the matr
On Wednesday 09 July 2008, Ben Bolker wrote:
> Dylan Beaudette wrote:
> | On Wednesday 09 July 2008, Ben Bolker wrote:
> |> ACroske yahoo.com> writes:
> |>> I have a large matrix full of probabilities; I would like to convert
>
> each
>
> |>> probability to a 1 or a 0 using rbinom.
> |>> How can I
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Hash: SHA1
Dylan Beaudette wrote:
| On Wednesday 09 July 2008, Ben Bolker wrote:
|> ACroske yahoo.com> writes:
|>> I have a large matrix full of probabilities; I would like to convert
each
|>> probability to a 1 or a 0 using rbinom.
|>> How can I do this on the
On Wednesday 09 July 2008, Ben Bolker wrote:
> ACroske yahoo.com> writes:
> > I have a large matrix full of probabilities; I would like to convert each
> > probability to a 1 or a 0 using rbinom.
> > How can I do this on the entire matrix? The matrix was converted from a
> > raster ArcMap dataset,
Is this what you're looking for?
test <- matrix(runif(100, 0, 1), nrow = 20)
nr <- nrow(test)
matrix(sapply(test, rbinom, n = 1, size = 1), nrow = nr)
ACroske wrote:
I have a large matrix full of probabilities; I would like to convert each
probability to a 1 or a 0 using rbinom.
How can I do th
ACroske yahoo.com> writes:
>
>
> I have a large matrix full of probabilities; I would like to convert each
> probability to a 1 or a 0 using rbinom.
> How can I do this on the entire matrix? The matrix was converted from a
> raster ArcMap dataset, so the matrix is essentially a map. Because of
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf
> Of Philip Twumasi-Ankrah
> Sent: Wednesday, May 28, 2008 6:52 AM
> To: [EMAIL PROTECTED]
> Cc: r-help@r-project.org
> Subject: Re: [R] "rbinom" : Does randomness preclude
To: [EMAIL PROTECTED]
Subject: RE: [R] "rbinom" : Does randomness preclude precision?
Charles,
When you simulate data from a distribution, what you effect are doing is
generating a sequence of values that would correspond to that distribution.
So you can generate 1000 values from a norma
: 614-455-3265
http://www.StatisticalEngineering.com
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Philip Twumasi-Ankrah
Sent: Wednesday, May 28, 2008 9:52 AM
To: [EMAIL PROTECTED]
Cc: r-help@r-project.org
Subject: Re: [R] "rbinom" : Does randomness preclude p
Teds reply is a bit comforting and as indicated in my post, I am resorting to
using "sample" but as an academic issue, does randomness preclude precision?
Randomness should be in the sequence of zeros and ones and how they are
simulated at each iteration of the process but not in the eventual n
On 28-May-08 12:53:26, Philip Twumasi-Ankrah wrote:
> I am trying to simulate a series of ones and zeros (1 or 0) and I am
> using "rbinom" but realizing that the number of successes expected is
> not accurate. Any advice out there.
>
> This is the example:
>
> N<-500
> status<-rbinom(N, 1, prob
You asked for each of 500 to be included with probability 0.15, not for
15% of 500. If you want the latter, use sample, e.g.
sample(c(rep(1,75), rep(0,425)))
And to see if your 77 is reasonable for binomial sampling:
binom.test(77, 500, 0.15)
Exact binomial test
data: 77 and 500
Do it again. What did you get this time? Then do it another time. Do you
see what is happening?
Charles Annis, P.E.
[EMAIL PROTECTED]
phone: 561-352-9699
eFax: 614-455-3265
http://www.StatisticalEngineering.com
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
G'day Sigalit,
On Fri, 23 Nov 2007 11:25:30 +0200
"sigalit mangut-leiba" <[EMAIL PROTECTED]> wrote:
> Hello,
> I have a loop with probability computed from a logistic model like
> this: for (i in 1:300){
>
> p[i]<-exp(-0.834+0.002*x[i]+0.023*z[i])/(1+exp(-0.834+0.002*x[i]+0.023
> +z[i]))
>
> x
I don't run into problems doing this:
x=rnorm(300)
z=rnorm(300)
for (i in 1:300){
p[i]<-exp(-0.834+0.002*x[i]+0.023*z[i])/(1+exp(-0.834+0.002*x[i]+0.023
+z[i])); T[i]<-rbinom(1,1,p[i])
}
hth, Ingmar
On 23 Nov 2007, at 10:25, sigalit mangut-leiba wrote:
> Hello,
> I have a loop with probabilit
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