RE: Describing variability

From: Leonid Gibiansky Subject: RE: [NMusers] Describing variability Date:Tue, 01 Apr 2003 07:44:28 -0500 Vladimir, I usually increase the precision until I get 3 significant digits in the output, and then happy with it. In one recent project I found out that changing the ADVAN routine helped to achieve convergence (even when the results were nearly identical). Saying that, you have to be sure that the results are independent of the precision. In one of the projects I faced the situation when the objective function fluctuated widely depending on the requested precision. This is not good, you would not want to accept it, would try to change the model, etc. (In that particular case, log-transformation solved the problem). Regards, Leonid