how to implement AR residual error model in Nonmem with FOCE INT routine

From: Ethan Wu Date: December 29, 2009 technical Source: mail-archive.com
Dear all, I am fitting a PK/PD model using FOCE INT. I do see a high correlation between WRES I wonder could someone help me with implementation of AR residual error model in NONMEM. Many thanks! Happy new year to all.