Re:

From: Alan Xiao Date: August 16, 2001 technical Source: cognigencorp.com
From: Alan Xiao <Alan.Xiao@cognigencorp.com> Subject: Re: Date: Thu, 16 Aug 2001 15:52:44 -0400 (Following your second comments). Then this means, even you get a perfect R and everything else is also perfect, your final model is still questionable since they might be simply because " that your minimum would lie somewhere along the boundary of your search space." And also, does your this sentence imply that the iterative values of (some) parameter estimates search along just one direction ? Or do we have other methods to diagnose this? Sorry, I just try to clarify the questions and find a solution to the porblem. Thanks, Alan. -- ***** Alan Xiao, Ph.D *************** ***** PK/PD Scientist *************** ***** Cognigen Corporation ********** ***** Tel: 716-633-3463 ext 265 ******
Aug 15, 2001 Alan Xiao Help: Non-positive semi-definite message
Aug 15, 2001 Atul Bhattaram Venkatesh Re: Non-positive semi-definite message
Aug 15, 2001 Stuart Help: Non-positive semi-definite message
Aug 15, 2001 Alan Xiao [Fwd: Re: Non-positive semi-definite message]
Aug 16, 2001 Vladimir Piotrovskij RE: Help: Non-positive semi-definite message
Aug 16, 2001 Erik Olofsen Re: Non-positive semi-definite message
Aug 16, 2001 Alan Xiao Re: Help: Non-positive semi-definite message
Aug 16, 2001 Peter Bonate S-matrix and RNGs
Aug 16, 2001 Vladimir Piotrovskij RE: Help: Non-positive semi-definite message
Aug 16, 2001 Alan Xiao Re: Help: Non-positive semi-definite message
Aug 16, 2001 Vladimir Piotrovskij RE: Help: Non-positive semi-definite message
Aug 16, 2001 Vladimir Piotrovskij RE: S-matrix and RNGs
Aug 16, 2001 Alan Xiao Re: Help: Non-positive semi-definite message
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Aug 16, 2001 Stuart Help: Non-positive semi-definite message
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Aug 20, 2001 Kenneth G. Kowalski RE: Help: Non-positive semi-definite message
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Aug 21, 2001 Kenneth G. Kowalski RE: Help: Non-positive semi-definite message
Aug 21, 2001 Nick Holford Re: Help: Non-positive semi-definite message
Aug 21, 2001 Kenneth G. Kowalski RE: Help: Non-positive semi-definite message
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Aug 22, 2001 Mats Karlsson Re: NNMUSERS : Non-positive semi-definite message
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Aug 22, 2001 Smith Brian P Re: Help: Non-positive semi-definite message
Aug 22, 2001 John Lukas NNMUSERS : Non-positive semi-definite message