合成指数扩散指数虽能有效地预测经济波动的转折点，但不能明确表示经济循环变化的强弱，为了弥补这一不足，我们编制了合成指数。它不仅考虑到各指标的波动状态，而且将它们的波动程度综合考虑进来。合成指数除了能预测经济波动的转折点外，还能在某种意义上反映经济循环变动? Synthetic index diffusion index can effectively predict the turning point of economic fluctuations, but can not clearly indicate the strength of the economic cycle changes, in order to make up for this deficit, we compiled the composite index. It takes into account not only the state of volatility of the indicators, but also the degree of their volatility. In addition to the synthetic index can predict the turning point in economic fluctuations, but also in a sense, reflect the changes in the economic cycle?