基于当前参考基准的官方生产者物价指数数据在以前的指数参考基准期是不可用的。
Official PPI data based on the current reference base are not available on previous index reference base periods.
应调高设计基准期等参数;
基准期标准值,通常在指数建立时确定,以当时的状况计算。
A standard value, usually set at the establishment of an index, from which its current level is calculated.
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