Re: [R] Covariance of data with missing values.

2007-08-15 Thread Ted Harding
On 15-Aug-07 21:16:32, Rolf Turner wrote: > > I have a data matrix X (n x k, say) each row of which constitutes > an observation of a k-dimensional random variable which I am willing, > if not happy, to assume to be Gaussian, with mean ``mu'' and > covariance matrix ``Sigma''. Distinct rows of X

Re: [R] Covariance of data with missing values.

2007-08-15 Thread Rolf Turner
Thank you ***very*** much Ted and Chuck. I will install these two packages and study them over, and then in all probability pester you with more questions when I find things that I don't understand! Thanks again. cheers, Rolf On 16

Re: [R] Covariance of data with missing values.

2007-08-15 Thread Chuck Cleland
Ted Harding wrote: > Hi Rolf! > > Have a look at the 'norm' package. > > This does just what you;re asking for (assuming multivariate > normal, and allowing CAR missingness -- i.e. probability of > missing may depend on observed values, but must not depend on > unobserved). > > Read the document

Re: [R] Covariance of data with missing values.

2007-08-15 Thread Ted Harding
Hi Rolf! Have a look at the 'norm' package. This does just what you;re asking for (assuming multivariate normal, and allowing CAR missingness -- i.e. probability of missing may depend on observed values, but must not depend on unobserved). Read the documentation for the various function *very* c

[R] Covariance of data with missing values.

2007-08-15 Thread Rolf Turner
I have a data matrix X (n x k, say) each row of which constitutes an observation of a k-dimensional random variable which I am willing, if not happy, to assume to be Gaussian, with mean ``mu'' and covariance matrix ``Sigma''. Distinct rows of X may be assumed to correspond to independent re