Re: [R] hdf files

2010-01-27 Thread Jarle Brinchmann
Are you sure these are hdf5 files? If they are HDF4 files you will not be able to load them with the hdf5 package. I am not aware of a HDF4 package for R but I might be wrong. If it is a HDF4 file you might find the conversion utility at http://www.hdfgroup.org/h4toh5/ useful. Cheers,

[R] Classification of supernovae - a challenge

2010-01-29 Thread Jarle Brinchmann
Hi all, I thought I'd just point out, to those not having yet seen this, that today there was a classification challenge posted for astronomy. The web-site is http://www.hep.anl.gov/SNchallenge/ [I have nothing to do with this project so don't ask me any details!] Basically the idea behind is t

[R] linear functional relationships with heteroscedastic & non-Gaussian errors - any packages around?

2008-12-01 Thread Jarle Brinchmann
Hi, I have a situation where I have a set of pairs of X & Y variables for each of which I have a (fairly) well-defined PDF. The PDF(x_i) 's and PDF(y_i)'s are unfortunately often rather non-Gaussian although most of the time not multi--modal. For these data (estimates of gas content in galaxies)

[R] linear functional relationships with heteroscedastic & non-Gaussian errors - any packages around?

2008-12-02 Thread Jarle Brinchmann
[apologies if this appears twice] Hi, I have a situation where I have a set of pairs of X & Y variables for each of which I have a (fairly) well-defined PDF. The PDF(x_i) 's and PDF(y_i)'s are unfortunately often rather non-Gaussian although most of the time not multi-modal. For these data (est

Re: [R] linear functional relationships with heteroscedastic & non-Gaussian errors - any packages around?

2008-12-02 Thread Jarle Brinchmann
Thanks for the reply! On Tue, Dec 2, 2008 at 6:34 PM, Prof Brian Ripley <[EMAIL PROTECTED]> wrote: > I wonder if you are using this term in its correct technical sense. > A linear functional relationship is > > V = a + bU > X = U + e > Y = V + f > > e and f are random errors (often but not necessa

Re: [R] linear functional relationships with heteroscedastic & non-Gaussian errors - any packages around?

2008-12-02 Thread Jarle Brinchmann
eling, handled by > the 'sem' package? > Spencer > > Jarle Brinchmann wrote: >> >> Thanks for the reply! >> >> On Tue, Dec 2, 2008 at 6:34 PM, Prof Brian Ripley <[EMAIL PROTECTED]> >> wrote: >> >>> >>> I wonder if

Re: [R] hypergeometric

2008-12-03 Thread Jarle Brinchmann
The dhyper etc deal with the hypergeometric _distribution_ while what you appear to want have is the hypergeometric special function (the connection is that the regular hypergeometric function is the generating function for the hypergeometric distribution if I recall correctly). Anyway, what you