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.
无法使用提供的参数计算周期数。
Cannot calculate number of periods using the arguments provided.
该研究采用测验法，考察数学学习不良(MD)儿童的早期数学认知能力，包括计数、数守恒、时空概念、逻辑、计算和操作等方面。
This study is on the mathematical cognition of MD, that includes count, quantity conservation, space-time conception, logic conception, calculation and manipulation.
附注1：每月利息之计算方法依照七十八规则。而提早偿还贷款会退回剩馀期数利息之50%。
Note 1: Monthly interest will be calculated as the Rule of 78. For early settlement, 50% of the remaining interest will be rebated.
附注1：每月利息之计算方法依照七十八规则。而提早偿还贷款会退回剩馀期数利息之50%。
Note 1: Monthly interest will be calculated as the Rule of 78. For early settlement, 50% of the remaining interest will be rebated.
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