SAS-Lers:

I'm forwarding this note on behalf of a non-subscriber, so be sure to Cc: her on with your replies, Dale...er...I mean, y'all. ;^) Thanks.

-Mike

><><><><><><><><><><><><><><><><><><><>< Michael Todd, Ph.D. University of Connecticut Health Center Alcohol Research Center-MC2103 Department of Psychiatry 263 Farmington Avenue Farmington CT 06030-2103

Voice: 860.679.5468 Fax: 860.679.5464 E-mail: todd@psychiatry.uchc.edu

-----Original Message----- From: Narmatha Thanigasalam [mailto:nthaniga@GPU.SRV.UALBERTA.CA] Sent: Tuesday, October 22, 2002 5:18 PM To: MULTILEVEL@JISCMAIL.AC.UK Subject: PROC NLMIXED Error Message

Dear Multilevelers,

I am trying to run a multilevel logistic model using PROC NLMIXED and I got the following error message:

ERROR: Quadrature accuracy of 0.000100 could not be achieved with 31 points. The achieved accuracy was 1.000000.

I tried increasing the quadrature tolerance (QTOL= option in PROC NLMIXED statement) and I am still getting the same error message. Am I overlooking something? What should I check for?

Thanks in advance.

Narmatha

Narmatha Thanigasalam MSc Senior Data Analyst Centre for Health Outcomes Research and Utilization Studies Department of Public Health Sciences University of Alberta 13-103 Clinical Sciences Building Edmonton, Alberta Canada T6G 2G3

Ph. (780) 492-7349 Fax. (780) 492-0364 Email: nthaniga@ualberta.ca

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