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I am running the rocof model named DLSHBL. The formula of rocof is (f2-f1)/(t2-t1) ,or it can be shown as (delta f / delta t) . However, I do not know how long is the length of the delta t. Thanks for all your help. P.S. my solution parameters : Iterations=25 Acceleration=0.5 Tolerance=0.01 DELT=0.0002