| Date: | Fri, 24 Jan 2003 13:56:26 -0500 |
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| Reply-To: | "Park, Ju-Hyeong" <gzp8@CDC.GOV> |
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| Sender: | "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU> |
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| From: | "Park, Ju-Hyeong" <gzp8@CDC.GOV> |
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| Subject: | Non-positive definite estimated G |
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| Content-Type: | text/plain |
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Hi forks,
I am analyzing variance component with a random model using Proc mixed. But
I have been facing "nonpositive definite estimated G" matrix issue when I
ran the model with one random effect and a fixed intercept. And I got zero
variance for the random effect. Is there any way to overcome this issue?
Any comments are very appreciated.
Thank you
Ju Park
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