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点击上方【蓝色】字体 关注我们 01 场景描述 1960年—1985年全国社会商品零售额如图1 所示 表1全国社会商品零售额数据 问题：试用三次指数平滑法预测1983年和1985年全国社会商品零售额？ 02 数据准备 create table sale_amount as select '1960' years , '696.6' sale_amount from dual union all select '1961' years , '607.7' sale_amount from dual union all select '1962' years , '604' sale_amount from dual union all select '1963' years , '604.5' sale_amount from dual union all select '1964' years , '638.2' sale_amount from dual union all select '1965' years , '670.3' sale_amount from dual union all select '1966' years , '732.8' sale_amount from dual union all select '1967' years , '770.5' sale_amount from dual union all select '1968' years , '737.3' sale_amount from dual union all select '1969' years , '801.5' s
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