样本误差 sampling error 在一个小样本中预期的比例会发生随机改变的现象。
所有报告的样本误差比率包括了加权和抽样设计设计效应计算在内。
All reported margins of sampling error include the computed design effects for weighting and sample design.
我们认为这是因为小样本误差和数据所在时间跨度较短所造成的。
We guess this is due to the small sample bias and the short time span of our data.
除了样本误差外，全国性的公众意见的调查操作上的困难也会导致误差。
In addition to sampling error, the practical difficulties of conducting any survey of public opinion may introduce other sources of error into the poll.
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