...经济指标的相关性不断升高,但是从单个项目来看这些渠道自身的波动性太大,与主要经济的相关性不强,受随机冲击(random shocks)的影响比较大,尤其是政策影响。
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Tones and foot shocks were administered separately at random intervals in the other group.
WSJ: Why Children Have More Control of Their Dreams
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