thank you David,
it was my first idea, but i don't know if it is right statistically
speaking!!!
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> -Original Message-
> From: r-help-boun...@r-project.org [mailto:r-help-bounces@r-
> project.org] On Behalf Of mary
> Sent: Tuesday, January 22, 2013 3:40 AM
> To: r-help@r-project.org
> Subject: Re: [R] Ellipse in PCA with parameters "a" and "b"defined.
&
Ok...
so, in my model my "a" is built using the standard deviation of the first
principal component and "b" with the second, so my "x" and "Y" should be :
PCA $ scores [, 1], PCA $ scores [, 2]
but in this way I do not get out a confidence interval set on my parameters
but many ellipses.
Thanks
On 01/22/2013 11:12 AM, mary wrote:
Hi,
I have to construct an ellipse interval region on a PCAbiplot, I have my
parameters "a" and "b" and I would apply the formula:
draw.ellipse(x, y, a = , b = )
I have done a PCA on my data so I have my scores and loading for the first
and second component,
Hi,
I have to construct an ellipse interval region on a PCAbiplot, I have my
parameters "a" and "b" and I would apply the formula:
draw.ellipse(x, y, a = , b = )
I have done a PCA on my data so I have my scores and loading for the first
and second component, but my answer is what I have to choose
Hi,
I would like to draw elliptic confidence interval. I know I can use a
package ellpise, but can I do it in this way:
I want to draw an ellipse countour i.e. all points in R^2 such that
t(x*-x)%*%A%*%(x*-x)<=c, for some x* in R^2 and constant c. A is 2x2 matrix.
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Typo: "**Paul_i** Exclusion Principle"
Bert Gunter
Genentech Nonclinical Biostatistics
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oun...@r-project.org [mailto:r-help-boun...@r-project.org] On
Behalf Of Tom La Bone
Sent: Monday, March 29, 2010 9:56 AM
To: r-help@r-project.org
Subject: Re: [R] Ellipse that Contains 95% of the Observed Data
I know what "get a bigger sample means". I have no clue what "ask a
I know what "get a bigger sample means". I have no clue what "ask a more
statistically meaningful question" means. Can you elaborate a bit?
Tom
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Easy. See below.
Bert Gunter
Genentech Nonclinical Biostatistics
-Original Message-
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
Behalf Of Tom La Bone
Sent: Monday, March 29, 2010 6:56 AM
To: r-help@r-project.org
Subject: Re: [R] Ellipse that Contains 95
for a picture of the bagplot, try going to
http://www.statmethods.net/graphs/boxplot.html
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Concisely, here is what I am trying to do:
#I take a random sample of 300 measurements. After I have the measurements
#I post stratify them to 80 type A measurements and 220 type B measurements.
#These measurements tend to be lognormally distributed so I fit them to
#determine the geometric me
The bagplot at
http://addictedtor.free.fr/graphiques/RGraphGallery.php?graph=112
gives a nonparametric 2-d view analagous to a boxplot.
S Ellison
>
> I can take the results of a simulation with one random variable and
generate
> an empirical interval that contains 95% of the observations, e.g.
On 03/29/2010 07:17 PM, Barry Rowlingson wrote:
...
I think the problem as posed doesn't produce a unique ellipse. You
could start with a circle of radius 0 centered on mean(x),mean(y) and
then increase the radius until it has 95% of the points in it. As long
as your points are in continuous sp
On Mon, Mar 29, 2010 at 4:02 AM, Ben Bolker wrote:
> I'll be interested to hear what others come up with.
> I'm not sure the problem as you have stated it is well-posed, or
> necessarily possible. Suppose there is a true unknown
> bivariate probability distribution with a non-elliptical 95%
> q
Tom La Bone gforcecable.com> writes:
>
>
> I can take the results of a simulation with one random variable and generate
> an empirical interval that contains 95% of the observations, e.g.,
>
> x <- rnorm(1)
> quantile(x,probs=c(0.025,0.975))
>
> Is there an R function that can take the re
I can take the results of a simulation with one random variable and generate
an empirical interval that contains 95% of the observations, e.g.,
x <- rnorm(1)
quantile(x,probs=c(0.025,0.975))
Is there an R function that can take the results from two random variables
and generate an empirical
Vishal gmail.com> writes:
>
> Jari, thanks for the quick answer.
>
> > sqrt(eigen(cov.trob(mydataforellipse)$cov)$values)
>
> what will this return?
>
> For my data, I get:
>
> > sqrt(eigen(cov.trob(r)$cov)$values)
> [1] 1.857733e-05 4.953181e-06
>
> Is this Left hand value the major or the
I forgot to mention that the ellipse has a rotation. It's horizontal
axis is not parallel to the x-axis.
Just repeating, when I try to draw a circuit keeping the center same
as the ellipse, and radius equal to the first value returned by
> sqrt(eigen(cov.trob(mydataforellipse)$cov)$values)
taking
Jari, thanks for the quick answer.
> sqrt(eigen(cov.trob(mydataforellipse)$cov)$values)
what will this return?
For my data, I get:
> sqrt(eigen(cov.trob(r)$cov)$values)
[1] 1.857733e-05 4.953181e-06
Is this Left hand value the major or the semi major length?
I also try to plot a circuit keepi
Vishal gmail.com> writes:
>
> I have a matrix(3000x2) of numbers and I have plotted a scatterplot
> (defined in the ``car'' library.)
>
> scatterplot(r$V1,r$V2,ellipse=TRUE)
>
> The ellipse plotted is an error ellipse.
>
> I want the find the major(semi), minor(semi) minor axis length of this
I have a matrix(3000x2) of numbers and I have plotted a scatterplot
(defined in the ``car'' library.)
scatterplot(r$V1,r$V2,ellipse=TRUE)
The ellipse plotted is an error ellipse.
I want the find the major(semi), minor(semi) minor axis length of this
ellipse.
Does anybody know how to do it?
I ca
On 05/05/2009 6:28 PM, Antonio Lucadamo wrote:
Dear all,
I'm using the ellipse package and I would like to verify if the
confidence region that I build with this package can be equivalent to
an Union Intersection Test. I used different value for the t-statistic
but I can not find the right eq
Dear all,
I'm using the ellipse package and I would like to verify if the
confidence region that I build with this package can be equivalent to
an Union Intersection Test. I used different value for the t-statistic
but I can not find the right equivalence.
Does someone know how to choose the
Dear all,
I'm using the ellipse package and I would like to verify if the
confidence region that I
build with this package can be equivalent to an Union Intersection
Test. I used different
value for the t-statistic but I can not find the right equivalence.
Does someone know how to choose the
Dear list moderator,
I'm sending you a solution i found to the question i asked the list yesterday
(i have not been able to figure out how to post it to the list directly).
elly<-function(w,col=array(1,dim(w)[1]),pch=array(1,dim(w)[1])){
p<-dim(w)[2]
op<-par(mfrow=c(3,3),mar=c
Hi dear list,
I'm scrambling with this:
i have a p-dimensional data frame for which i want to have a pairs() plot, with
ellipse added in each lower.panel.
I want the ellipse's parameter (mu, sigma) to be extracted from the appropriate
entries in a pre-computed matrix ("dab" in the code below)
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