A.預(yù)測目標(biāo)的趨勢(shì)不斷變化時(shí),n值應(yīng)取大一點(diǎn) B.具有階躍型特點(diǎn)的數(shù)據(jù),n值應(yīng)取小一點(diǎn) C.n值越大,預(yù)測值的修勻程度越高 D.n值越小,預(yù)測值對(duì)數(shù)據(jù)變化的反應(yīng)速度也越快