sample variability
... 样本单位 sample unit 样本变异性 sample variability 样本变异数 sample variance ...
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利用统计不定性随机变量，结合现有结构的特点，提出荷载、抗力变异性的小样本统计推断方法；
Secondly, by introducing the random variable that is statistical ambiguity, the statistics of loading and resistance of existing structure are researched.
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