Displaying 20 results from an estimated 6000 matches similar to: "[Package car/data.ellipse]: confidence intervals off by factor sqrt(2)??? (PR#2584)"
2013 Jan 26
2
confidence / prediction ellipse
Hi,
I'm using the R library(car) to draw confidence/prediction ellipses in a
scatterplot.
>From what i understood the ellipse() function return an ellipse based
parameters: shape, center, radius .
If i read dataEllipse() function i can see how these parameters are
calculated for a confidence ellipse.
ibrary(car)
a=c(12,12,4,5,63,63,23)
b=c(13,15,7,10,73,83,43)
v <-
2010 Aug 19
1
Correlograms and linear regression
Dear all,
I generated a Correlograms and used the panel.ellipse (confidence ellipse
and smoothed line) option. Is there a way to get instead of the smoothed
line the linear regression?
Thanks,
As hz
--
View this message in context: http://r.789695.n4.nabble.com/Correlograms-and-linear-regression-tp2331071p2331071.html
Sent from the R help mailing list archive at Nabble.com.
2012 Feb 07
2
3D confidence ellipsoid with ellipse projections onto 2D plane
I have a 3xN matrix of parameters obtained from N regressions where the 3
parameters are jointly statistically significant. I would like to reproduce
a 3D confidence ellipsoid projecting 2D ellipses onto the XY plane as in
Figure 5.2 in this
2013 Sep 15
1
DataEllipse versus Ellipse Function in R
Hi:
Does Ellipse and dataellipse function in R produce the same ellipse? I
wanted to see how the radius for the Ellipse function in R calculated. Also
what is the var-covariance matrix, if any, assumed for the dataellipse
function? Heres an example of the code where I am generating Multivariate
normal data and creating ellipse using the 2 functions:
library(car)
library(mvtnorm)
mu =
2011 May 28
2
Observation in a confidence ellipse
Hello everyone
I really need some help here. I made a confidence ellipse using the function ellipse from the package ellipse:
ellipse(SD, centre=colMeans(pcsref),t=sqrt((p * (n-1)/(n-p))*qf(0.99, p,n-p))
Now, I want to write a function whom return TRUE or FALSE if a given observation is in the confidence ellipse. But I have no clue how to do it
Can anyone help me?
Best regards
Jessica
2004 Oct 27
3
ploting an ellipse keeps giving errors
library (ellipse)
shape1 = c (1, 0, 0,1)
dim(shape1) = c(2,2)
ellipse (center = c(0,0), shape = shape1, radius = 1)
=============================
Error in plot.xy(xy.coords(x, y), type = type, col = col, lty = lty, ...) :
plot.new has not been called yet
It is really frustrating. Also what do the shape matrix, radius correspond to an ellipse function
(x-x0)^2/a + (y-y0)^2/b = 1
?
2003 Oct 28
2
Confidence ellipse for correlation
Hello,
SAS' point and click interface has the option of produce a scatterplot with a
superimposed confidence ellipse for the correlation coefficient. Since I
generally like R so much better, I would like to reproduce this in R. I've
been playing with the ellipse package. In order to have the points and the
ellipse on the same graph I've done the following.
(Load ellipse
2009 Apr 08
1
Is a point into an ellipse
Hi,
I drew an ellipse with the package ellipse. Now I would like to know if
a point is inside the ellipse. Is any R functions to do it without
computing the equation of the ellipse manually? Thanks.
For example, if I do "plot(ellipse(0.8), type = 'l')", I would like to
know if (0,1) belongs to the drawn ellipse.
Regards,
Alain
--
Alain Guillet
Statistician and Computer
2011 Aug 24
1
df of numerator and denominator
hello
I need to know the dfn and dfd of my Anova. But in the Anova output there is
only "Df".
Is this the dfn or the dfd? and how do I get both of it in R?
Thanks for any answers
--
View this message in context: http://r.789695.n4.nabble.com/df-of-numerator-and-denominator-tp3765526p3765526.html
Sent from the R help mailing list archive at Nabble.com.
2011 Jun 06
2
adding an ellipse to a PCA plot
Hi,
I created a principal component plot using the first two principal
components. I used the function princomp() to calculate the scores.
now, I would like to superimpose an ellipse representing the center
and the 95% confidence interval of a series of points in my plot (as
to illustrate the grouping of my samples).
I looked at the ellipse() function in the ellipse package but can't
get it
2010 Mar 28
3
Ellipse that Contains 95% of the Observed Data
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(10000)
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 ellipse that contains 95% of the observations,
e.g.,
x <- rnorm(10000)
y <- rnorm(10000)
?
2013 Jan 22
3
Ellipse in PCA with parameters "a" and "b"defined.
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 as X and Y into
the formula?
if "a" and "b" are scalars or
2005 Sep 09
1
Plotting an ellipse in 3D
I have been using the ellipse function from the car package and the
covariance matrix to draw an ellipse around a group of points to show the
confidence limits. However, the points are actually represented by 3
variables so rather than plot each pairwise combination of variables in 2D I
would like to plot the 'ellipse' in 3D using the djmrgl package. Can anyone
offer advice on how I can
2005 Oct 04
1
Rcmdr and scatter3d
Hi folks,
I'd like to use scatter3d (which is in R commander) to plot more than one
dataset in the same graph, each dataset with a different color. The kind
of stuff you would do with "holdon" in Matlab.
I read a recent message that was posted to this list with a similar
problem, but I couldn't understand the reply. Could someone give me one
example? How do you plot subgroups
2011 Feb 24
2
how to plot equalprobable error ellipse?
hi,R users,
Now I have some scatter figures, is there some method can plot equalprobable
error ellipse ?
--
TANG Jie
Email: totangjie@gmail.com
Tel: 0086-2154896104
Shanghai Typhoon Institute,China
[[alternative HTML version deleted]]
2005 Jun 15
1
ellipse -confidence interval
Hi!, I made a plot with two variables representing the first two axis of a
principle component analysis. My question is:
How can I superimpose on such plot an ellipse that represent the 95% interval of
confidence of scores?
Best regards,
Paula
--
Lic. Paula Gonzalez
Divisi??n Antropolog??a
Museo de La Plata.
Facultad de Ciencias Naturales y Museo. UNLP.
Paseo del Bosque s/n?? - B1900FWA - La
2005 Aug 18
2
how to draw an ellipse
That's probably a stupid question, but I'm looking for a low-level
command which plots ellipse, specifying only center and deformation
axes. The purpose is to illustrate bivariates gaussians with 2D .95
confident levels without using any specific library.
Thanxs for your help,
Guillaume
2010 Sep 29
1
Fitting a half-ellipse curve
Dear mailing list,
I have following array:
X2 Y2
[1,] 422.7900 6.0
[2,] 469.8007 10.5
[3,] 483.9428 11.0
[4,] 532.4917 25.5
[5,] 596.1942 33.5
[6,] 630.8496 40.5
[7,] 733.2996 45.0
[8,] 946.4779 32.0
[9,] 996.8068 35.5
[10,] 1074.3310 23.0
I do afterwards the following:
plot.new()
plot.window(xlim=c(min(X1)-50,max(X1)+50),
2011 Sep 27
1
Adding axis to an ellipse: "ellipse" package
Dear list members,
This might be a silly question but I just can't figure it out. I am using
the "ellipse" package on covariance matrices. I would simply like to plot my
ellipses WITH its two axis ploted as well. These axis represents the 2 eigen
vectors of my matrix and it is important that I can graphically show them.
Is there an easy way to do so?
Many thanks,
Antoine
--
View
2005 Dec 09
1
Ellipse ASR-Model Report Descriptor tree
Hi all
Arnaud,
Some newly purchased Ellipse ASR-model UPS find their way to my office for
a first evaluation test.
It concerns the Ellipse 1500 and Ellipse 1000 models.
As you know we are still working with hidups.
Peripheral recognition, start of NUT, mains short interruptions management,
all that work fine... as expected ;-)
But changes occured on the delayed shutdown procedure after the