极限误差是指抽样推断中依一定概率保证下的误差的最大范围，所以也称为允许误差。估计量加上允许误差形成置信区间的上限，估计量减去允许误差形成置信区间的下限。极限误差表现为某置信度的临界值( 或称概率度)乘以抽样平均误差。即：极限误差= 临界值x 抽样平均误差。
在设定的参数条件下，计算各种方法的极限误差。
Under the known parameters, the limit errors of those are showed out by numerical calculation.
建立了采样点均匀分布情况下，圆度误差测量采样点数量与测量极限误差之间的定量关系数学模型。
Under the situation of even distribution of fitting nodes, a mathematic model is established by means of the relation between the number of fitting nodes and the limit error of measurement.
量子测量中精度的标准极限，源于与可计数离散粒子，而不是连续量相关的统计误差。
The standard limit on the precision with which a quantum measurement can be carried out is due to the statistical error associated with counting discrete particles rather than continuous quantities.
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