missing objective function values

From: Yi Zhang Date: May 08, 2008 technical Source: mail-archive.com

I am working on a pkpd model and trying to do a sensitivity analysis of each pd parameters by examine the changes in OFV. However, there were instances that OFV were not given in the output, instead NM gave out "**************". Please note this did not always happen, only when parameters were set to certain values. Has anyone encountered this before and have an idea what might be the reason? Thanks in advance. Yi

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