On Mar 2, 2012, at 05:55 , ilai wrote: > What do you make of the following from ?riwish > " > riwish(v, S) > <snip> > v: Degrees of freedom (scalar). > " > does a m/2 parameterization yield a scalar for, say, 3 dof ?
Er, yes.... (scalar does not imply integer) As a general matter: 1. This is the Open Source world, you can read the actual function and see what it does. It might even say so in the comments. 2. You can investigate empirically -- the moments are known as a function of the parameters (check Wikipedia), so how about simulating a few thousand matrices and looking at the means and variances. (I don't do IW on a daily basis, but AFAICT, the two parametrizations have roughly the same mean, but a factor of two between variances, so it should be fairly easy to spot whether it is one or the other.) -- Peter Dalgaard, Professor, Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Email: pd....@cbs.dk Priv: pda...@gmail.com ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
