Re: Cross product matrix

Date: Mon, 22 Nov 1999 14:25:29 -0800 (PST) From: ABoeckmann <alison@c255.ucsf.edu> Subject: Re: Cross product matrix A few remarks from Stuart Beal ... ------------------------------------- In reference to paragraph 1 of Steve's note: See NONMEM References, Methodological, Item 2. In reference to paragraph 2 of Steve's note: It is not always the case that the S matrix is invertible. When it is invertible, and when the R matrix is also computable and invertible, it does not follow that the SE using one of the two methods is related to the SE using the other method. If the R matrix is not invertible, one better stop and ask why this is, rather than plow ahead and compute the inverse of S. Stu Beal