search for: fittedvaluet

...edvalue=abs(fittedvalue) signfittedvalue=sign(fittedvalue) MAPE= ( (sum (abs( (absy-absfittedvalue) /absy)) )/ n) *100 MAPE=MAPE*signy*signfittedvalue also would not be correct. But how can we cope with this difficulty? For remainder DS could be got by: DS= sum(dt=(yt-yt-1)*(fittedvaluet-fittedvaluet-1))*100/N dt=1 if (yt-yt-1)*(fittedvaluet-fittedvaluet-1)>=0 dt=0 otherwise Thanks a lot for any idea. Amir Safari --------------------------------- [[alternative HTML version deleted]]