Displaying 9 results from an estimated 9 matches for "rmvt".

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2017 Oct 09

2

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

1

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

1

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

1

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,...

2017 Oct 09

1

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).
> > >...

2017 Oct 08

1

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 08

1

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...

2017 Oct 09

1

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...

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