故障率数据FRD ？
现有的分层抽样算法中故障率数据不准确是导致测试性验证试验结果不可信的一个原因。
Inaccuracies in the present proportionate stratified sampling algorithm based on fuzzy failure rate data is one main cause which makes the testability demonstration results untrustworthy.
不完全子样法是可靠性预处理的一种方法，包括瞬间故障率法、数据归定法、约翰逊法等。
Then the author mentioned that the incomplete subsampling is one of reliability preprocessing methods, it includes instantaneous failure, data induction and Johnson method, etc.
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