为了剔除季节因素影响应采取哪些步骤?
(1) 计算4期移动平均值。(2) 用原始数据除以移动平均值,求出季节比率。(3) 计算季节比率的算术平均值,剔除随机因素(偶然波动因素)的影响。(4)对各季度的季节比率的平均值加以调整,求出季节指数。(5)用原始数据除以季节指数,再乘以100,剔除季节因素的影响。
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