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【多选题】
关于“季节性因素”即季节指数，说法正确的是（ ）A.
原序列数值与移动平均数列数值的比率。
B.
刻画了现象在一个年度内各季（月）的变化特征。
C.
季节指数大于1，说明该期为“旺季”，反之则为“淡季”。
D.
对含有季节波动的数据进行预测时，从原序列中用季节指数剔除季节波动后，再进行长期趋势的预测，即为最终预测结果。
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