Re: [NMusers] residual variability

2016-09-29 Thread Leonid Gibiansky
the modeling Thanks, Abdullah *From:* Leonid Gibiansky *Sent:* Tuesday, September 27, 2016 5:49:00 PM *To:* Sultan,Abdullah S; nmusers@globomaxnm.com *Subject:* Re: [NMusers] residual variability Abdullah, Do you have

Re: [NMusers] residual variability

2016-09-28 Thread Sultan,Abdullah S
From: Leonid Gibiansky Sent: Tuesday, September 27, 2016 5:49:00 PM To: Sultan,Abdullah S; nmusers@globomaxnm.com Subject: Re: [NMusers] residual variability Abdullah, Do you have random effect on the lag time? Models with random effects on the lag time are very difficult to work with, try to

Re: [NMusers] residual variability

2016-09-27 Thread Leonid Gibiansky
Abdullah, Do you have random effect on the lag time? Models with random effects on the lag time are very difficult to work with, try to remove the lag and use the transit compartment(s) to describe the delay. Make sure you have INTERACTION option on the estimation step, use METHOD=1. Sometimes