RE: Rounding errors

From: "KOWALSKI, KENNETH G. [PHR/1825]" <kenneth.g.kowalski@pharmacia.com> Subject: RE: Rounding errors Date: Fri, 23 Mar 2001 08:37:02 -0600 Pete, With regards to item 1, this message is often an indication that your model is over-parameterized in some fashion. This could be due to the structural model (fixed effects), a high degree of collinearity among the covariates in your model, or the variance-covariance structure of the model. I think the last is often overlooked. You may need to simplify some aspect of your model to get the model to run. Ken