-----Original Message-----From: [email protected] [mailto:[email protected]]On Behalf Of Alfredo GriecoSent: Friday, July 20, 2001 4:09 AMTo: [email protected]Subject: [ns] periods hi at all, in the multistate error model, the array periods means deterministic duration of each state or mean duration of each state? if it is mean duration what is the stochastic law of this duration? Alfredo