Displaying 14 results from an estimated 14 matches for "rmvt".
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2017 Oct 09
3
example of geom_contour() with function argument
...t in a classroom 30 years ago,
and can no longer run off to the instructor :-(
I apologize but I cut and paste the wrong snippet earlier and made a typo
in doing so, but the result is the same with the more appropriate snippet.
require(mvtnorm)
require(ggplot2)
set.seed(1234)
xx <- data.frame(rmvt(100, df = c(13, 13)))
v <- ggplot(data = xx, aes(x = X1, y = X2, z = dmvt, df = c(13,13)))
v + geom_contour()
Don't know how to automatically pick scale for object of type function.
Defaulting to continuous.
Error: Aesthetics must be either length 1 or the same as the data (100): x,
y, z,...
2017 Oct 09
0
example of geom_contour() with function argument
library(mvtnorm) # you were misusing "require"... only use require if
you plan to
library(ggplot2) # test the return value and fail gracefully when the
package is missing
set.seed( 1234 )
xx <- data.frame( rmvt( 100, df = c( 13, 13 ) ) )
xx2 <- expand.grid( X1 = seq( -5, 5, 0.1 ) # all combinations... could
be used to fill a matrix
, X2 = seq( -5, 5, 0.1 )
)
# compute density as a function of the grid of points
xx2$d <- dmvt( as.matrix( xx2[,1:2] ) ) # feels we...
2017 Oct 09
2
example of geom_contour() with function argument
...t I can not see how to provide a pdf in place of the density
function which calculates a KDE (that is, something from the dataset in the
example). Can you please point to the specific example that might help?
Here is what I get:
require(mvtnorm)
require(ggplot2)
set.seed(1234)
xx <- data.frame(rmvt(100, df = c(13, 13)))
v <- ggplot(faithfuld, aes(waiting, eruptions, z = drmvt, df = c(13,13)))
v + geom_contour()
Don't know how to automatically pick scale for object of type function.
Defaulting to continuous.
Error: Aesthetics must be either length 1 or the same as the data (5625):
x,...
2010 May 10
2
Warning message
...f (!freq) "Density" else "Frequency" :
the condition has length > 1 and only the first element will be used
-----------------------------------------------------------------------------------
library(mvtnorm);
s12<-c(1:1000);
var21<-lapply(s12,function(x){
rs<-rmvt(10, sigma=diag(8), df=1);
my<-mean(rs);
sy<-sqrt(var(rs))
return(cbind(my,sy))
});
data1<-do.call(rbind,var21);
dataMat<-data.frame(data1);
W<-dataMat$my;
hist(W,breaks=20,probability=T)
----------------------------------------------------------------------------------...
2017 Oct 09
0
example of geom_contour() with function argument
...of the density
> function which calculates a KDE (that is, something from the dataset in the
> example). Can you please point to the specific example that might help?
>
> Here is what I get:
>
> require(mvtnorm)
> require(ggplot2)
> set.seed(1234)
> xx <- data.frame(rmvt(100, df = c(13, 13)))
>
>
> v <- ggplot(faithfuld, aes(waiting, eruptions, z = drmvt, df = c(13,13)))
> v + geom_contour()
>
> Don't know how to automatically pick scale for object of type function.
> Defaulting to continuous.
> Error: Aesthetics must be either len...
2017 Oct 09
2
example of geom_contour() with function argument
...en it there also but I thought that this
> > list of experts may have someone who knows the answer.
> >
> > I have the following example code:
> >
> >
> >
> > require(mvtnorm)
> > require(ggplot2)
> > set.seed(1234)
> > xx <- data.frame(rmvt(100, df = c(13, 13)))
> > ggplot(data = xx, aes(x = X1, y= X2)) + geom_point() + geom_density2d()
> >
> >
> >
> > It yields a scatterplot of X2 against X1 and a KDE contour plot of the
> > density (as it should).
> >
> > My question is: is it possibl...
2017 Oct 08
2
how to overlay 2d pdf atop scatter plot using ggplot2
...plot-2d-probability-density-function-on-top-of-points-on-ggplot
Apologies for those who have seen it there also but I thought that this
list of experts may have someone who knows the answer.
I have the following example code:
require(mvtnorm)
require(ggplot2)
set.seed(1234)
xx <- data.frame(rmvt(100, df = c(13, 13)))
ggplot(data = xx, aes(x = X1, y= X2)) + geom_point() + geom_density2d()
It yields a scatterplot of X2 against X1 and a KDE contour plot of the
density (as it should).
My question is: is it possible to change the contour plot to display
the contours
of a two-dimensional d...
2017 Oct 09
0
example of geom_contour() with function argument
...> list of experts may have someone who knows the answer.
> > >
> > > I have the following example code:
> > >
> > >
> > >
> > > require(mvtnorm)
> > > require(ggplot2)
> > > set.seed(1234)
> > > xx <- data.frame(rmvt(100, df = c(13, 13)))
> > > ggplot(data = xx, aes(x = X1, y= X2)) + geom_point() +
> geom_density2d()
> > >
> > >
> > >
> > > It yields a scatterplot of X2 against X1 and a KDE contour plot of the
> > > density (as it should).
> > >...
2003 Feb 15
2
(no subject)
Hi,
Are there some packages which can generate multi-normal, multi-t, etc
multivariate sampling? thanks!
Best wishes,
Peng
*******************************
Peng Zhang
Department of Biostatistics
Harvard School of Public Health
655 Huntington Avenue
Boston, Massachusetts 02115
*******************************
I believe I can fly
I believe I can touch the sky
2017 Oct 08
0
how to overlay 2d pdf atop scatter plot using ggplot2
...lot
>
> Apologies for those who have seen it there also but I thought that this
> list of experts may have someone who knows the answer.
>
> I have the following example code:
>
>
>
> require(mvtnorm)
> require(ggplot2)
> set.seed(1234)
> xx <- data.frame(rmvt(100, df = c(13, 13)))
> ggplot(data = xx, aes(x = X1, y= X2)) + geom_point() + geom_density2d()
>
>
>
> It yields a scatterplot of X2 against X1 and a KDE contour plot of the
> density (as it should).
>
> My question is: is it possible to change the contour plot to disp...
2002 Oct 02
4
T-Distribution
Dear sir,
I would ask if there are in R some code to generate a random sample
from a mvariate student distribution like that one wich generate the
multivariate normal one i mean( rmvnorm(n, mu, sigma)
Second question : if R can plot density 3Dcurve I don't mean de
histogram but de hole density function(normal for example).
I use a windows version of The R software
Thank you in advance
wiyh
2005 Feb 24
1
Density of the Multivariate T Distribution
Hi,
I am looking for an efficient way to compute the
values of the density function of a multivariate T
distribution - something like "dmvnorm", but for T
distr. Does this exist somewhere?
Many thanks,
Jan Bulla
Goettingen University
2007 Oct 09
1
Multivariate chi-square distribution function
Dear All,
Is there any function in R for computing "multivariate chi-square
distribution"?
How about "multivariate gamma distribution"?
I appreciate any comment on this subject.
Thank you,
Amin Zollanvari
PhD student
Department of Electrical and Computer Engineering,
Texas A&M University,
College Station, TX
2010 Aug 24
0
mlm for within subject design
...6752 8.580032
cov(x2)
[,1] [,2] [,3]
[1,] 1.0786150 0.4719868 0.5082440
[2,] 0.4719868 0.9608204 0.4819515
[3,] 0.5082440 0.4819515 1.0264072
colMeans(x2)
[1] 1.042077 5.011792 10.025397
Package mvtnorm also has a function to obtain samples from multivariate-t
distributions (rmvt). See the help pages of these functions for examples and
further details.
For simulating random fields, there are two packages of which I'm aware:
RandomFields and FieldSim. It might also be worth checking out the Spatial
Task View @ CRAN to see if anything else is available to help you.
HTH,...