It is rather a difficult issue for statistical agencies how to estimate price index accurately, while quality adjustment is one of those factors which influence the accuracy.
如何准确地计算价格指数成为困扰各国统计机构的一个难题，而质量调整是目前影响价格指数准确性的重要因素之一。
In general, where there are no statistical agencies, persons qualified to take up professional statistical posts shall be put in charge of statistics.
不设统计机构的，一般应由具备相当统计专业职务条件的人员担任统计负责人。
Statistical agencies typically have very little actual data for the last month of the quarter at the time they release their first estimates of quarterly GDP.
当统计局首次估计季度GDP时，他们几乎没有季度最后一个月的真实数据。
Statistical agencies typically have very little actual data for the last month of the quarter at the time they release their first estimates of quarterly GDP.
当统计局首次估计季度GDP时，他们几乎没有季度最后一个月的真实数据。
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