fffffffff表176季1234123412341234123412341234度销售量61510410181571426231219282518223428212436302028403527季节指数090
136112062090136112062090136112062090136112062090136112062090136112062090136112062消除季节因素的销量671108965111
132134113156191205194211206223290244250250339267265268323311294313435使用消除季节因素后的时间序列确定时间序列的趋势，可以得到直线方程为Tt633106t在第八年第四个季度，t32，故Tt633106×324025。第四季度的季节指数是062，故预测值为4025×0622496。750
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