环比指数指通过把某一时期的数值与前一时期的数值相比，而不是与固定基期相比而得出的指数。
Chain index an index number derived by relating the value at any given period to the value in the previous period rather than to a fixed base.
然后再对所有的期货商品，以持仓金额为权重，计算对于基期数据比值的加权算数平均值，得到指数值。
To get the index, we firstly compute the mathematic average for single commodity price, using price and trading volume of all contracts.
然后再对所有的期货商品，以持仓金额为权重，计算对于基期数据比值的加权算数平均值，得到指数值。
To get the index, we firstly compute the mathematic average for single commodity price, using price and trading volume of all contracts.
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