Similar to the method of Z index of precipitation, a trial research is made on monitoring drought by the amount of cloud, and the method of Z index of cloud amount is established.

类似于降水量Z指标法对旱情的监测，进行了云参数监测旱情的研究，建立了云量监测的Z指标法。

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He and his team computed z-scores for each variable and country, and averaged them to create the Workers Utopia Index.

FORBES: Introducing The Workers Utopia Index