The theory of economic cycle involves the research on the length of economic cycle. Compared with the ARMA method frequency scale method has several advantages.
经济周期的理论必然涉及经济周期长度的研究，相对于常用的自回归移动平均方法，谱分析方法具备一定的优点。
Meanwhile, grey wave forecasting of grey system theory is explained, and the method is applied to economic cycle index forecasting.
阐明了灰色系统理论中灰色波形预测的方法，并将该方法应用到经济循环指数预测中。
Grey wave forecasting of grey system theory is applied to economic cycle index forecasting. The forecasting result is highly closed to the reality.
成功地将灰色系统的波形预测方法运用到经济循环指数预测中，得到了与实际经济波动高度吻合的结果。
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