“forecast lead=2 id=time;”，利用拟合模型对序列作2期预测，参考这文章试一下http://wenku.baidu.com/link?url=PBIpKMMgEf9nfFPGzlSz0CKlspANb3rnup1scY067Me6QOFz5eM6tS74DkGibf7XSwsN1FwvxnJtByjy7EAkNRwS68dRI2hu5CeQ0dI_DJK