andy_liaw at merck.com
Wed Oct 2 19:50:46 CEST 2002
> From: bojaniss [mailto:bojaniss at poczta.onet.pl]
> Hello Hicham,
> Wednesday, October 2, 2002, 11:28:03 AM, you wrote:
> HZ> Dear sir,
> HZ> I would ask if there are in R some code to generate a
> random sample
> HZ> from a mvariate student distribution like that one wich
> generate the
> HZ> multivariate normal one i mean( rmvnorm(n, mu, sigma)
> Try rt() function, type ?rt for help.
That's _univariate_ t. Use the mvtnorm package for multivariate t
> HZ> Second question : if R can plot density 3Dcurve I don't mean de
> HZ> histogram but de hole density function(normal for example).
> I think sm.density function in sm package (available on CRAN) will
> do what you want.
That gives the kernel density estimate, given data. It's not clear what
Hicham wants. If he wants the _true_ density of a multivariate t, he needs
to contruct a grid (e.g., with expand.grid) and evaluate the multivariate t
density on that grid, then use persp to draw the surface.
> hope this helps
> Michal Bojanowski - mbojanowski at samba.iss.uw.edu.pl
> Polish General Social Survey
> Institute for Social Studies
> University of Warsaw
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