Because some products show no failure in the random truncation test period, this paper USES the meanrank order method to calculate the empirical cumulative distribution function.
考虑随机截尾试验中有些试验产品无故障数据出现，提出采用平均秩次法计算经验分布函数。
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Results: There was significantly decrease the meanrank of uncertainty in illness scores both on the day before operation and the day before discharge in the experimental group ( P< 0.05);