Displaying 20 results from an estimated 1000 matches similar to: "multivariate sampling question again"
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
2005 Aug 03
1
multivariate F distribution
Dear List,
Is there any function in R to generate multivariate F distribution with
given correlation/covariance matrix?
Actually, I just want to generate some 2-dimentional non-normal data
sets (skewed) for low (may be around 0.3 cor coeff.) negatively and also
positively correlated variables ?
Thanks in advance.
Anna
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
2011 Oct 17
1
Build 64-bit R Solaris 10 Sparc
Hello All,
Has anyone had success building 64-bit R on Solaris 10 Sparc with the Oracle Studio Compiler suite? Could anyone start give me a clue. I have tried to no avail.
Thanks,
Nynese
Nynese Tinsley, BSEE, MSCIS
UNIX Systems Analyst
Harvard School of Public Health
Center for Biostatistics in AIDS Research
651 Huntington Ave, FXB 614
Boston, MA 02115
617-432-3244 office#
2012 Mar 01
1
Parameterization of Inverse Wishart distribution available in MCMCpack and bayesm libraries
Hello Everyone
Both the MCMCpack and the bayesm libraries allow us to make draws from the
Inverse Wishart distribution.
But I wanted to find out how exactly is the Inverse Wishart distribution
parameterized in these libraries.
The reason I ask is the following:
Now its generally standard to express Inverse Wishart as IW(0.5 * DOF,0.5*
Scale). (DOF-> Degree of freedom, Scale -> Scale
2003 Feb 09
2
installation on FreeBSD
Hello there,
I just changed to FreeBSD platform, and want to install R on it. I use
FreeBSD 5.0 and install nearly all packages on the machine. When I use
ports to install R, (cd /usr/ports/math/R-letter, and then type make) I
got the following error information.
../../../../library/methods/libs/methods.so is unchanged
dumping R code in package 'methods'
Fatal error: The X11 shared
2012 Feb 05
1
Simulating from a Normal Inverted Wishart distribution
Hello everyone
I was wondering how would one simulate from a Normal Wishart Distribution
in R.
A normal inverted Wishart distribution is denoted by NIW (M,C,d,S), where
X/(Sigma) ~ N( M,C,(Sigma) ) -> a matrix normal distribution, (Sigma) ->
column dispersion matrix
(Sigma) ~ IW (d,S) -> inverted Wishart distribution
Thanks a lot !
Best
Shantanu
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2005 Jul 26
1
Wishart Density
Dear R users,
I am doing MCMC using Metropolis-Hastings. My model is
bivariate-log-normal and the prior for variance-covariance is wishart
distribution. I am wondering if there are some simple codes about how
to get the density of Wishart distribution in my case ?
Thanks in advance.
Meihua
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2010 Sep 06
1
sample a matrix with one element to be 1 from wishart distribution
Hi,
I am not sure if this make sense at all. I'd like to sample a matrix, which
follows a wishart / inverted wishart distribution. However, the (1,1)
element of this matrix should always be equal to 1. How can I handle it in
R? Any suggestion is greatly appreciated. Thanks a lot.
Sonia
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2010 Feb 12
1
R - Compiling and calling Fortran code that uses IMSL libraries - Help!
Good Afternoon R Help!
On of my users is seriously thinking about moving to R from Splus. In his
testing, he has already found some benefits to it. He has, however run
into one issue, calling his Fortran functions in R. Previously, in Splus,
he would do the following:
1. Compile via f90 the *.f program
2. link the object file to the Fortran IMSL libraries via the 'ld' command
3.
2004 Oct 28
1
plot.baysian error = only 0's may mix with negative subscripts
Dear R users and developers
After upgrading to Windows XP and R 1.9.1 and 2.0, I retried to execute
plot.baysian() to a data set that I had used previously to plot with no
problem in win2000 R1.8. The error I get is:
Error in points(Mbar[-index], lods[-index], pch = ".") :
only 0's may mix with negative subscripts
Thanx in advance
Dino
P.S. I allready sent this message
2008 Apr 18
1
configure can't find dgemm in MKL10
Hi,
I'm trying to follow the R-admin instructions for using MKL10 as the external BLAS compiling R-2.6.2 under Linux on a RH EL head node of a cluster. The configure process seems to have problems when it checks for dgemm in the BLAS. I'm using configure as:
./configure CC=icc F77=ifort --with-lapack="$MKL" --with-blas="$MKL" where $MKL is defined as in R-admin
2005 Apr 28
1
riwish() problem
R users-
In moving from R 2.0.0 to R 2.1.0 in Windows, I have encountered a problem
with the "riwish" command in the package "MCMCpack". I've searched the
documentation and can't seem to figure it out. For example:
Define a matrix:
> lam <- matrix(c(.00233,-.00057,-.00057,.00190),2,2)
and then use the riwish command to generate a random inverse-Wishart
2010 Aug 30
2
Regarding naive baysian classifier in R
Hi,
I have a small doubt regarding naive Bayes. I am able to classify the
data's properly but i am just stuck up with how to get the probability
values for naive bayes. In the case of SVM we have "attr" function that
helps in displaying the probability values. Is there any function similar to
"attr" in naive Bayes that can be used for displaying the attribute values.
my
2009 Nov 21
3
python
Dear R users,
I would like to make my R code for MCMC faster. It is possible to integrate
C code into R but I think C is too complicated for me. I would need a C
introduction only for MCMC and I do not know if such a thing exists.
I was thinking of Python (and scipy). Where could I read about its
integration into R ? How developed are the statistical packages in Python ?
I could not find a
2010 Aug 27
2
multivariate distributions
Hi,
How can I generate data from multivariate gamma distribution & multivariate
beta distribution?
I only found command for multivariate normal only.
Many thanks in advance :)
Regards
Rofizah
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2010 Sep 27
1
Modify the vertex label
Dear r-help,
I create a graph of my baysian network. I use the package igraph. The names
of vertex are within the circle, I would leave them outside the circle?
> E(g)$color <- "black"
> tkplot(g, ,vertex.label=names,layout=layout.kamada.kawai,
edge.color=E(g)$color)
Best Regards
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2011 Apr 24
1
EM vs Bayesian
Hello,
Is there any literature there that says that the EM is better/worse than a
Baysian model when it comes to differentiating univariate mixture of normal
distributions?
--
Thanks,
Jim.
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2019 Mar 28
1
default for 'signif.stars'
I read through the editorial.
This is the one of the most mega-ultra-super-biased articles I've ever read.
e.g.
The authors encourage Baysian methods, and literally encourage subjective
approaches.
However, there's only one reference to robust methods and one reference to
nonparametric methods, both of which are labelled as purely exploratory
methods, which I regard as extremely
2004 Dec 16
1
help with multiple imputation using imp.mix
I am desperately trying to impute missing data using 'imp.mix' but always
run into this yucky error message to which I cannot find the solution. It's
the first time I am using mix and I'm trying really hard to understand, but
there's just this one step I don't get...perhaps someone knows the answer?
Thanks!
Jens
My code runs: